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_dbm_gnu.py b/Lib/test/test_dbm_gnu.py
index 73203b6..857aeb1 100755
--- a/Lib/test/test_dbm_gnu.py
+++ b/Lib/test/test_dbm_gnu.py
@@ -1,4 +1,5 @@
-import dbm.gnu as gdbm
+from test import support
+gdbm = support.import_module("dbm.gnu") #skip if not supported
import unittest
import os
from test.support import verbose, TESTFN, run_unittest, unlink