* sysdeps/unix/sysv/linux/kernel-posix-timers.h: Don't declare
__timer_helper_thread. Declare __start_helper_thread, __helper_once,
and __helper_tid.
(struct timer): Remove th and bar field.
* sysdeps/unix/sysv/linux/timer_create.c (timer_create): Remove
debugging code. Create only one helper thread.
* sysdeps/unix/sysv/linux/timer_delete.c (timer_delete): Don't kill
helper thread.
* sysdeps/unix/sysv/linux/timer_routines.c (timer_helper_thread):
Renamed. Define statically. Use thread info from siginfo.
(__helper_once): New variable.
(__helper_tid): New variable.
(__reset_helper_control): New function.
(__start_helper_thread): New function.
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