libstdc++: Enable std::auto_ptr tests for C++11 and later

libstdc++: Enable std::auto_ptr tests for C++11 and later

There is no reason to only test std::auto_ptr with -std=c++03, we just
need to handle the deprecated warnings for C++11 and later.

libstdc++-v3/ChangeLog:

	* testsuite/20_util/auto_ptr/1.cc: Remove dg-options -std=c++03
	and add dg-warning for deprecation warnings.
	* testsuite/20_util/auto_ptr/2.cc: Likewise.
	* testsuite/20_util/auto_ptr/3.cc: Likewise.
	* testsuite/20_util/auto_ptr/3946.cc: Likewise.
	* testsuite/20_util/auto_ptr/4.cc: Likewise.
	* testsuite/20_util/auto_ptr/5.cc: Likewise.
	* testsuite/20_util/auto_ptr/6.cc: Likewise.
	* testsuite/20_util/auto_ptr/7.cc: Likewise.
	* testsuite/20_util/auto_ptr/assign_neg.cc: Likewise.
	* testsuite/20_util/auto_ptr/requirements/explicit_instantiation/1.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/assign/auto_ptr.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/assign/auto_ptr_neg.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/assign/auto_ptr_rvalue_neg.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/auto_ptr.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/auto_ptr_neg.cc:
	Likewise.