Use SIGABRT to trigger breakpad in hangs on UNIX to make these easier to distinguish from SIGSEGV crashes rs=ted no bug

--HG--
extra : rebase_source : 6fad8dba8c062f3f0bf54fb29e0f1ae64d0bec0b

build/automation.py.in

@@ -565,8 +565,8 @@ user_pref("camino.use_system_proxy_settings", false); // Camino-only, harmless t
     reporting, if we know how for this platform. Otherwise just .kill() it."""
     if self.CRASHREPORTER:
       if self.UNIXISH:
-        # SEGV will get picked up by Breakpad's signal handler
-        os.kill(proc.pid, signal.SIGSEGV)
+        # ABRT will get picked up by Breakpad's signal handler
+        os.kill(proc.pid, signal.SIGABRT)
         return
       elif self.IS_WIN32:
         # We should have a "crashinject" program in our utility path