This is a no-op since the line was already commented out, to make it
compile on FreeBSD. But it deserves an explanation:

The _POSIX_C_SOURCE macro is meant to restrict the C library to a
certain POSIX standard, not to enable features. This is inappropriate
here because:

1. Jack already uses non-POSIX functions. E.g. JackPosixSemaphore.cpp
   references gettimeofday(), which is part of the X/Open specs.

2. C++ does not define a POSIX level to be based on. Headers from the
   C++ standard library may (and do) break when the POSIX feature level
   is restricted.

The canonical way is to only set the feature level through the
"--std=gnu++11" compile options.

This is forbidden (returns EINVAL)

Adjusts the permissions of posix semaphores when promiscuous mode is enabled.

Note that changing permissions of semaphores is only supported on linux by
using the /dev/shm filesystem. As of now, linux does not use posix semaphores
anymore so this code is currently unsed.

This doesn't seem necessary since it is implmented below

Crash was observed in this function when fSemaphore was NULL, this patch
copies the NULL pointer check from the commented function above into
Wait()

Original patch by

 Luciano Montanaro <luciano.montanaro@magnetimarelli.com>

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