[PATCH] Define std::allocator<T>::is_always_equal

[Jonathan Wakely <jwakely at redhat dot com>]

I somehow only added the is_always_equal nested typedef to the
allocator<void> specialization, not the primary template. All the
containers still do the right thing, because they use
allocator_traits<allocator<T>>::is_always_equal which gives the right
answer, but we still need to provide allocator<T>::is_always_equal to
be conforming.

	* include/bits/allocator.h (allocator<T>::is_always_equal): Define.
	* testsuite/20_util/allocator/requirements/typedefs.cc: Test for
	is_always_equal.
	* testsuite/util/testsuite_allocator.h
	(uneq_allocator::is_always_equal): Define as false_type.

Tested powerpc64le-linux, committed to trunk/

Attachment: patch.txt
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