libstdc++: Rename tests like .../wchar_t/1.cc to .../wchar_t.cc

libstdc++: Rename tests like .../wchar_t/1.cc to .../wchar_t.cc

There's no need to have directories containing a single test file, we
can rename the files to the directory names and remove the directories.

The dejagnu proc that filters out wchar_t tests just checks for
"wchar_t" anywhere in the path, so will work just as well on wchar_t.cc
or constexpr-wchar_t.cc paths.

libstdc++-v3/ChangeLog:

	* testsuite/21_strings/basic_string/modifiers/pop_back/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/modifiers/pop_back/char.cc:
	...here.
	* testsuite/21_strings/basic_string/modifiers/pop_back/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/modifiers/pop_back/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/modifiers/swap/wchar_t/constexpr.cc:
	Moved to...
	* testsuite/21_strings/basic_string/modifiers/swap/constexpr-wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/modifiers/swap/char/constexpr.cc:
	Moved to...
	* testsuite/21_strings/basic_string/modifiers/swap/constexpr.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/contains/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/contains/char.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/contains/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/contains/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/data/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/data/char.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/data/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/data/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/ends_with/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/ends_with/char.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/ends_with/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/ends_with/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/starts_with/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/starts_with/char.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/starts_with/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/starts_with/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/substr/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/substr/char.cc:
	...here.
	* testsuite/21_strings/basic_string/operations/substr/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/operations/substr/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/range_access/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/range_access/char.cc:
	...here.
	* testsuite/21_strings/basic_string/range_access/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/range_access/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/swap/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/swap/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/modifiers/swap/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/modifiers/swap/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/contains/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/contains/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/contains/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/contains/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/data/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/data/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/data/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/data/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/ends_with/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/ends_with/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/ends_with/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/ends_with/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/starts_with/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/starts_with/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/starts_with/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/starts_with/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/substr/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/substr/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/operations/substr/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/operations/substr/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/range_access/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/range_access/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/range_access/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/range_access/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char16_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char16_t.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char32_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char32_t.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char8_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char8_t.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/int.cc:
	...here.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/wchar_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char16_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char16_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char32_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char32_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char8_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char8_t.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/int.cc:
	...here.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/wchar_t.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char16_t/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char16_t.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char32_t/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char32_t.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char8_t/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/char8_t.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/short/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/short.cc:
	...here.
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/wchar_t/1.cc:
	Moved to...
	* testsuite/21_strings/char_traits/requirements/explicit_instantiation/wchar_t.cc:
	...here.