Update.

Update.

	* 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.