re PR c++/60786 (In C++11 an explicit instantiation with an unqualified name must be in the right namespace)

	PR c++/60786
	* testsuite/20_util/shared_ptr/requirements/explicit_instantiation/
	1.cc: Fix invalid explicit instantiations with unqualified names.
	* testsuite/20_util/shared_ptr/requirements/explicit_instantiation/
	2.cc: Likweise.
	* testsuite/20_util/tuple/53648.cc: Likweise.
	* testsuite/20_util/weak_ptr/requirements/explicit_instantiation/1.cc:
	Likewise.
	* testsuite/20_util/weak_ptr/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/requirements/
	debug_container.cc: Likewise.
	* testsuite/23_containers/unordered_map/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/requirements/debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/requirements/debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_set/requirements/
	debug_container.cc: Likewise.
	* testsuite/23_containers/unordered_set/requirements/
	explicit_instantiation/3.cc: Likewise.

From-SVN: r209431