gccrs: Move builtin macro tests to their own directory

gccrs: Move builtin macro tests to their own directory

We need a finer grain to filter tests and organise them.

gcc/testsuite/ChangeLog:

	* rust/compile/builtin_macro_compile_error.rs: Move to...
	* rust/compile/macros/builtin/compile_error.rs: ...here.
	* rust/compile/builtin_macro_concat.rs: Move to...
	* rust/compile/macros/builtin/concat.rs: ...here.
	* rust/compile/builtin_macro_eager1.rs: Move to...
	* rust/compile/macros/builtin/eager1.rs: ...here.
	* rust/compile/builtin_macro_eager2.rs: Move to...
	* rust/compile/macros/builtin/eager2.rs: ...here.
	* rust/compile/builtin_macro_eager3.rs: Move to...
	* rust/compile/macros/builtin/eager3.rs: ...here.
	* rust/compile/builtin_macro_env.rs: Move to...
	* rust/compile/macros/builtin/env.rs: ...here.
	* rust/compile/builtin_macro_include_bytes.rs: Move to...
	* rust/compile/macros/builtin/include_bytes.rs: ...here.
	* rust/compile/builtin_macro_include_bytes_location_info.rs: Move to...
	* rust/compile/macros/builtin/include_bytes_location_info.rs: ...here.
	* rust/compile/builtin_macro_include_str.rs: Move to...
	* rust/compile/macros/builtin/include_str.rs: ...here.
	* rust/compile/builtin_macro_include_str_location_info.rs: Move to...
	* rust/compile/macros/builtin/include_str_location_info.rs: ...here.
	* rust/compile/builtin_macro_not_found.rs: Move to...
	* rust/compile/macros/builtin/not_found.rs: ...here.
	* rust/compile/builtin_macro_recurse2.rs: Move to...
	* rust/compile/macros/builtin/recurse2.rs: ...here.
	* rust/compile/macros/builtin/builtin_macro.exp: New test.
	* rust/compile/invalid_utf8: Move invalid-utf8 data to...
	* rust/compile/macros/builtin/invalid_utf8: ...here.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>