mpm_event,worker: Mask signals for threads created by modules in child init.

[apache] / server / mpm / worker / config3.m4

APACHE_MPMPATH_INIT(worker)

dnl ## XXX - Need a more thorough check of the proper flags to use
APACHE_MPM_MODULE(worker, $enable_mpm_worker, worker.lo fdqueue.lo,[
    AC_CHECK_FUNCS(pthread_kill)
])

APACHE_MPMPATH_FINISH