This is not needed yet for htl (only the Linux mq_notify), but we can as
well just simplify the header.
const pthread_barrierattr_t *__restrict
__attr, unsigned int __count)
__THROW __nonnull ((1));
-#if PTHREAD_IN_LIBC
libc_hidden_proto (__pthread_barrier_init)
-#endif
extern int __pthread_barrier_wait (pthread_barrier_t *__barrier)
__THROWNL __nonnull ((1));
-#if PTHREAD_IN_LIBC
libc_hidden_proto (__pthread_barrier_wait)
-#endif
/* This function is called to initialize the pthread library. */
extern void __pthread_initialize (void) __attribute__ ((weak));