mutex (mutex::try_lock): Eat errors.

2008-05-14  Benjamin Kosnik  <bkoz@redhat.com>

	* include/std/mutex (mutex::try_lock): Eat errors.
	(mutex::unlock): Same.
	(recursive_mutex::try_lock): Eat errors.
	(recursive_mutex::unlock): Same.
	* testsuite/30_threads/mutex/dest/destructor_locked.cc: Add
	-pthreads, adjust line numbers.
	* testsuite/30_threads/mutex/native_handle/1.cc: Same.
	* testsuite/30_threads/mutex/cons/1.cc: Same.
	* testsuite/30_threads/mutex/try_lock/1.cc: Same.
	* testsuite/30_threads/mutex/try_lock/2.cc: Same.
	* testsuite/30_threads/mutex/lock/1.cc: Same.
	* testsuite/30_threads/mutex/unlock/1.cc: Same.
	* testsuite/30_threads/recursive_mutex/dest/destructor_locked.cc: Same.
	* testsuite/30_threads/recursive_mutex/native_handle/1.cc: Same.
	* testsuite/30_threads/recursive_mutex/cons/1.cc: Same.

From-SVN: r135321