signals: handle_fatal_signal: use SA_NODEFER
signals: handle_fatal_signal: use SA_NODEFER

SA_RESETHAND | SA_NODEFER allows the "re-trigger default signal handler"
trick to work for signals other than SIGSEGV.

Signed-off-by: Colin McCabe <c0eabe2887ac1e91c280795b9fca010e21066283@hq.newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph