bitbake: process: Ensure abnormal exits set an error level

(Bitbake rev: 8f5c1cdae1ee6ce04ae0d04d0b95bd80efbf7534)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/server/process.py

@@ -203,7 +203,7 @@ class ProcessEventQueue(multiprocessing.queues.Queue):
 
     def waitEvent(self, timeout):
         if self.exit:
-            raise SystemExit
+            sys.exit(1)
         try:
             if not self.server.is_alive():
                 self.setexit()