Use PTHREAD_MUTEX_DEFAULT in static init and mutexattr_init. If the
default mutex type changes to NORMAL, when there is an uninitialized
mutex provided to unlock, allow it to succeed similar to an un

Use PTHREAD_MUTEX_DEFAULT in static init and mutexattr_init. If the
default mutex type changes to NORMAL, when there is an uninitialized
mutex provided to unlock, allow it to succeed similar to an unlocked
mutex. For other cases abort instead of segfault. okay guenther@

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Add pthread_rwlockattr_{get,set}pshared() and
pthread_mutexattr_{get,set}kind_np()

tweaked diff from brad

Split out the pthread_mutexattr_* functions from rthread_sync.c to
new file rthread_mutexattr.c. Add basic implementations of
pthread_mutexattr_{set,get}{protocol,prioceiling}

Requested by aja