* sysdeps/unix/sysv/linux/lowlevellock.c (__lll_timedlock_wait):
If we time out, try one last time to lock the futex to avoid
losing a wakeup signal.
* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Likewise.