Forward lockfile calls from libc to dynamically loaded libpthread

* forward.c: (__libc_pthread_functions_init): Add variable
(FORWARD2): Use __libc_pthread_functions_init instead of testing
__libc_pthread_functions.ptr_##name value.
(FORWARD_NORETURN): Add macro.
(pthread_exit): Use FORWARD_NORETURN instead of FORWARD2.
* libc_pthread_init.c (__libc_pthread_init): Set
__libc_pthread_functions_init to 1.
* pthread/pthread-functions.h (__pthread_once, __pthread_rwlock_rdlock,
__pthread_rwlock_wrlock, __pthread_rwlock_unlock, __pthread_key_create,
__pthread_getspecific, __pthread_setspecific, _cthreads_flockfile,
_cthreads_funlockfile, _cthreads_ftrylockfile): Add prototypes.
(pthread_functions): Add ptr_pthread_once, ptr_pthread_rwlock_rdlock,
ptr_pthread_rwlock_wrlock, ptr_pthread_rwlock_unlock,
ptr_pthread_key_create, ptr_pthread_getspecific, ptr_pthread_setspecific,
ptr__IO_flockfile, ptr__IO_funlockfile, ptr__IO_ftrylockfile.
(__libc_pthread_functions_init): Add variable declaration.
(PTHFCT_CALL): Add macro.
* pthread/pt-initialize.c (pthread_functions): Initialize ptr_pthread_once,
ptr_pthread_rwlock_rdlock, ptr_pthread_rwlock_wrlock, pthread_rwlock_unlock,
ptr_ptr_pthread_key_create, pthread_getspecific, ptr_pthread_setspecific,
ptr_ptr__IO_flockfile, _IO_funlockfile, ptr__IO_ftrylockfile.
* sysdeps/generic/pt-once.c (pthread_once): Rename to __pthread_once
(pthread_once): Add strong alias.
* sysdeps/generic/pt-rwlock-rdlock.c (pthread_rwlock_rdlock): Rename to
__pthread_rwlock_rdlock
(pthread_rwlock_rdlock): Add strong alias.
* sysdeps/generic/pt-rwlock-wrlock.c (pthread_rwlock_wrlock): Rename to
__pthread_rwlock_wrlock
(pthread_rwlock_wrlock): Add strong alias.
* sysdeps/generic/pt-rwlock-unlock.c (pthread_rwlock_unlock): Rename to
__pthread_rwlock_unlock
(pthread_rwlock_unlock): Add strong alias.
* sysdeps/generic/pt-getspecific.c (pthread_getspecific): Rename to
__pthread_getspecific
(pthread_getspecific): Add strong alias.
* sysdeps/generic/pt-setspecific.c (pthread_setspecific): Rename to
__pthread_setspecific
(pthread_setspecific): Add strong alias.
* sysdeps/pthread/flockfile.c: Add file.
* sysdeps/pthread/ftrylockfile.c: Add file.
* sysdeps/pthread/funlockfile.c: Add file.

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