uClibc_pthread.h: remove __pthread_mutex_destroy, unused

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/common/bits/uClibc_pthread.h

@@ -33,7 +33,6 @@ struct _pthread_cleanup_buffer;
  * weak so that we can elide them from single-threaded processes.  */
 extern int weak_function __pthread_mutex_init (pthread_mutex_t *__mutex,
 		__const pthread_mutexattr_t *__mutex_attr);
-extern int weak_function __pthread_mutex_destroy (pthread_mutex_t *__mutex);
 extern int weak_function __pthread_mutex_lock (pthread_mutex_t *__mutex);
 extern int weak_function __pthread_mutex_unlock (pthread_mutex_t *__mutex);
 extern int weak_function __pthread_mutex_trylock (pthread_mutex_t *__mutex);