* sysdeps/unix/sysv/linux/sh/lowlevelmutex.S: Define
__lll_mutex_timedlock_wait only for NOT_IN_libc.
* sysdeps/unix/sysv/linux/sh/libc-lowlevelmutex.S: Include
lowlevelmutex.S.
* sysdeps/unix/sysv/linux/sh/lowlevellock.S: Define
lll_unlock_wake_cb, __lll_wait_tid, and __lll_timedwait_tid only
for NOT_IN_libc.
* sysdeps/unix/sysv/linux/sh/libc-lowlevellock.S: Include
lowlevellock.S.