(issue 11214) - fix asyncore.strerror test failure on AIX

Lib/test/test_asyncore.py

@@ -329,7 +329,7 @@ class DispatcherTests(unittest.TestCase):
         if hasattr(os, 'strerror'):
             self.assertEqual(err, os.strerror(errno.EPERM))
         err = asyncore._strerror(-1)
-        self.assertIn("unknown error", err.lower())
+        self.assertTrue(err != "")
 
 
 class dispatcherwithsend_noread(asyncore.dispatcher_with_send):