fix KeyboardInterrupt

- was broken with recent signal() changes

gevent/hub.py

@@ -145,7 +145,7 @@ class Hub(greenlet):
     def run(self):
         global _threadlocal
         assert self is getcurrent(), 'Do not call run() directly'
-        self.keyboard_interrupt_signal = signal(2, MAIN.throw, KeyboardInterrupt)
+        self.keyboard_interrupt_signal = signal(2, core.active_event, MAIN.throw, KeyboardInterrupt)
         try:
             loop_count = 0
             while True: