disable sys_timerfd() for 2.6.23

There is still some confusion and disagreement over what this interface should
actually do.  So it is best that we disable it in 2.6.23 until we get that
fully sorted out.

(sys_timerfd() was present in 2.6.22 but it was apparently broken, so here we
assume that nobody is using it yet).

Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Davide Libenzi <davidel@xmailserver.org>
Acked-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

init/Kconfig

@@ -488,6 +488,7 @@ config SIGNALFD
 config TIMERFD
 	bool "Enable timerfd() system call" if EMBEDDED
 	select ANON_INODES
+	depends on BROKEN
 	default y
 	help
 	  Enable the timerfd() system call that allows to receive timer