Fix gnu11 fallout on Solaris 10+

	libobjc:
	* thr.c (_XOPEN_SOURCE): Define as 600.

	libiberty:
	* sigsetmask.c (_POSIX_SOURCE): Remove.

	libgomp:
	* config/posix/lock.c (_XOPEN_SOURCE) Define as 600.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@217117 138bc75d-0d04-0410-961f-82ee72b054a4