Check more robustly for timer_settime.
This should fix an OS X build problem reported by Ivan Andrus in <http://lists.gnu.org/archive/html/emacs-devel/2012-09/msg00671.html>. * admin/merge-gnulib (GNULIB_MODULES): Add timer-time. * configure.ac (gl_THREADLIB): Define to empty, since Emacs does threads its own way. * lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate. * m4/timer_time.m4: New file, from gnulib. * src/atimer.c (alarm_timer, alarm_timer_ok, set_alarm, init_atimer): Use HAVE_TIMER_SETTIME, not SIGEV_SIGNAL, to decide whether to call timer_settime.
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