Allow skipping of regression tests not supported on windows.  This reduces noise in the regression test suite for py3k on Windows.
diff --git a/Lib/test/test_pty.py b/Lib/test/test_pty.py
index 3be7c97..66c4de3 100644
--- a/Lib/test/test_pty.py
+++ b/Lib/test/test_pty.py
@@ -1,6 +1,7 @@
+from test import support
+pty = support.import_module("pty") #skip if not supported
 import errno
 import fcntl
-import pty
 import os
 import sys
 import signal