The LWG 3522 issue constrains all constructors of container adaptors
that have InputIterator parameters.

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

libstdc++-v3/ChangeLog:

	* include/bits/stl_queue.h (priority_queue): Constrain
	constructors with InputIterator parameters (LWG 3522).
	* testsuite/23_containers/priority_queue/lwg3522.cc: New test.

Tested powerpc64le-linux. Committed to trunk.