ecore: poll the thread pipe twice during shutdown

Summary:
this resolves a race condition when a thread join was pending during
shutdown but a pipe write was needed in order for the join to be
successfully executed before shutdown had occurred

@fix

Reviewers: cedric

Reviewed By: cedric

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D5866

Reviewed-by: Cedric Bail <cedric@osg.samsung.com>

src/lib/ecore/ecore.c

@@ -424,6 +424,7 @@ ecore_shutdown(void)
     * It should be fine now as we do wait for thread to shutdown before
     * we try to destroy the pipe.
     */
+     _ecore_pipe_wait(_thread_call, 1, 0.1);
      p = _thread_call;
      _thread_call = NULL;
      _ecore_pipe_wait(p, 1, 0.1);