* sysdeps/i386/i486/bits/atomic.h: Fix a few unused definitions.
* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Remove all trace of
lll_wake_tid. This was used only to work around kernel limits in
the early days.
* sysdeps/unix/sysv/linux/s390/lowlevellock.h: Likewise.
* sysdeps/unix/sysv/linux/sh/libc-lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/sh/lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/sh/lowlevellock.h: Likewise.