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mutex: Switch the POSIX backend to PTHREAD_MUTEX_RECURSIVE

Marvin Scholz requested to merge ePirat/libbluray:pthread-recursive-fix into master

The code for recursive mutexes triggered Undefined Behavior and crash as pthread_equal(3) was not used in a portable way. On the first call of mutex_lock() pthread_equal() was called with a pthread_t of value -1 which is invalid.

Passing a non valid thread ID to pthread_equal is undefined.

Switch the backend to native interface for POSIX recursive mutexes with PTHREAD_MUTEX_RECURSIVE and simplify the code.

Detected on NetBSD/amd64 9.99.46.

Signed-off-by: Marvin Scholz epirat07@gmail.com

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