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

[Julien Danjou]

At 1255023475 time_t, Samuel Thibault wrote:
> Ok then fine, please revert.

Done.

-- 
Julien Danjou
// ᐰ <julien at danjou.info>   http://julien.danjou.info
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