Defect in XSH <pthread.h>

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        Defect report from : Ulrich Drepper , Red Hat, Inc.

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@ page 290 line 10324-10327 section <pthread.h> objection {ud-14}

Problem:

Defect code :  1. Error

The functions pthread_rwlock_timedrdlock() and
pthread_rwlock_timedwrlock() are unconditionally required if
_POSIX_THREADS is defined.  The timeout variants of all other
synchronization functions are required only if _POSIX_TIMEOUTS is
defined.

I think these two functions should also be governed by the same option.

Action:

Shade lines 10324-10327 and mark them TMO.