Fix std::deque move construction with non-equal allocators.

Fix std::deque move construction with non-equal allocators.

	* include/bits/stl_deque.h (_Deque_base::_Deque_base(_Deque_base&&)):
	Dispatch according to whether allocators are always equal.
	(_Deque_base::_M_move_impl()): Implement move-from state.
	* testsuite/23_containers/deque/requirements/dr438/assign_neg.cc: Fix
	dg-error line number.
	* testsuite/23_containers/deque/requirements/dr438/
	constructor_1_neg.cc: Likewise.
	* testsuite/23_containers/deque/requirements/dr438/
	constructor_2_neg.cc: Likewise.
	* testsuite/23_containers/deque/requirements/dr438/insert_neg.cc:
	Likewise.

From-SVN: r217322