make sure to remove the signal from the worker pipe

The signal was never removed from the pie which was always waking up the worker
triggering a CPU spike.

fix #1269

gunicorn/workers/base.py

@@ -254,4 +254,4 @@ class Worker(object):
 
     def handle_winch(self, sig, fname):
         # Ignore SIGWINCH in worker. Fixes a crash on OpenBSD.
-        return
+        self.log.debug("worker: SIGWINCH ignored.")

gunicorn/workers/sync.py

@@ -34,6 +34,8 @@ class SyncWorker(base.Worker):
             self.notify()
             ret = select.select(self.wait_fds, [], [], timeout)
             if ret[0]:
+                if self.PIPE[0] in ret[0]:
+                    os.read(self.PIPE[0], 1)
                 return ret[0]
 
         except select.error as e: