This adds a feature that was recently added to the C++23 working draft.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/stl_queue.h
	(__cpp_lib_adaptor_iterator_pair_constructor): Define for C++23, as
	per P1425R4.
	(queue(InputIterator, InputIterator)): Likewise.
	(queue(InputIterator, InputIterator, const Alloc&)): Likewise.
	* include/bits/stl_stack.h
	(__cpp_lib_adaptor_iterator_pair_constructor): Likewise.
	(stack(InputIterator, InputIterator)): Likewise.
	(stack(InputIterator, InputIterator, const Alloc&)): Likewise.
	* include/std/version (__cpp_lib_adaptor_iterator_pair_constructor):
	Define.
	* testsuite/23_containers/queue/cons_from_iters.cc: New test.
	* testsuite/23_containers/stack/cons_from_iters.cc: New test.

Tested powerpc64le-linux. Committed to trunk.