[Xcb] [libpthread-stubs] fix semaphore signal safety

[Julien Danjou]

At 1253982451 time_t, Jamey Sharp wrote:
> An alternative question: If the semaphore functions aren't related to
> pthreads, why are we adding them to pthread-stubs?

Is there a chance someone says yes or no so that I can revert or not the
patch adding them?

-- 
Julien Danjou
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