* mutex.c (pthread_mutexattr_settype): New; allow

	the following types of mutex:
	  PTHREAD_MUTEX_DEFAULT
	  PTHREAD_MUTEX_NORMAL
	  PTHREAD_MUTEX_ERRORCHECK
	  PTHREAD_MUTEX_RECURSIVE
	(pthread_mutex_lock): Process the lock request
	according to the mutex type.

	* mutex.c: No longer use Win32 mutexes as the
	basis of POSIX mutexes when TryEnterCriticalSection
	isn't supported; implement our own versions of
	ptw32_{Initialize,Delete,TryEnter,Enter,Leave}CriticalSection
	functions to emulate TryEnterCriticalSection when
	it isn't supported by the system; don't allow recursive
	mutex locks (similar to PTHREAD_MUTEX_ERRORCHECK
	on other systems).
	- Thomas Pfaff <tpfaff@gmx.net>

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