Defining _POSIX_SEMAPHORES for Cygwin

[Gerald S. Williams]

I would like to define _POSIX_SEMAPHORES in sys/features.h
for Cygwin. According to POSIX, you define this when you
support the semaphore API.

We are now 99% of the way to having Python thread support
for Cygwin. I got POSIX semaphore support added to Python's
source base and tested it with Cygwin. Now we just have to
indicate that Cygwin has them.

The API is there and appears to work correctly. Is there
any issue with making this change?

-Jerry

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