[issue8299] Improve GIL in 2.7

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> if _POSIX_SEMAPHORES is defined, thread_pthread.h is designed to use
> the (fair) semaphore.  If it is not present, or
> HAVE_BROKEN_POSIX_SEMAPHORES defined, the semaphore is supposed to be
> emulated using a condition variable.
> Now, I don't have access to a mac or linux machine, but does a modern
> python build perhaps actually have USE_SEMAPHORES defined?

Yes, it does.
Actually, I find it unlikely that any modern Unix would fall back on the
non-semaphore version. All this code is (mostly) very old.

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