Allow Native Client applications to use Posix semaphores: sem_init(), sem_destroy(), sem_wait(), etc. BUG=http://code.google.com/p/nativeclient/issues/detail?id=471 TEST=nacl_ui_tests still pass
Allow Native Client applications to use Posix semaphores:
sem_init(), sem_destroy(), sem_wait(), etc.
BUG=http://code.google.com/p/nativeclient/issues/detail?id=471
TEST=nacl_ui_tests still pass

Review URL: http://codereview.chromium.org/2091002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@47277 0039d316-1c4b-4281-b951-d872f2087c98

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