Issue #7272:  Add configure test to detect whether sem_open works
properly, and use this to skip test_multiprocessing on platforms
where sem_open raises a signal.  This should fix some FreeBSD buildbot
failures for test_multiprocessing.
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index 29c7ff9..b16629b 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -17,7 +17,7 @@
 import socket
 import random
 import logging
-import test_support
+from test import test_support
 from StringIO import StringIO