Tests for the implicit allocator rebinding extension will fail if the
extension is disabled, so skip them.

	* testsuite/23_containers/array/requirements/explicit_instantiation/
	3.cc: Skip test when compiled with a -std=c++NN strict mode.
	* testsuite/23_containers/deque/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/forward_list/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/list/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/map/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/multimap/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/multiset/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/set/requirements/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/unordered_map/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_multiset/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/unordered_set/requirements/
	explicit_instantiation/3.cc: Likewise.
	* testsuite/23_containers/vector/ext_pointer/explicit_instantiation/
	3.cc: Likewise.
	* testsuite/23_containers/vector/requirements/explicit_instantiation/
	3.cc: Likewise.

From-SVN: r265334