On WIndows, skip the part of test_dircache that can't work on Windows.

Lib/test/test_dircache.py

@@ -5,7 +5,7 @@
 
 import unittest
 from test_support import run_unittest, TESTFN
-import dircache, os, time
+import dircache, os, time, sys
 
 
 class DircacheTests(unittest.TestCase):
@@ -40,6 +40,12 @@ class DircacheTests(unittest.TestCase):
         # Check that cache is actually caching, not just passing through.
         self.assert_(dircache.listdir(self.tempdir) is entries)
 
+        # Directories aren't "files" on Windows, and directory mtime has
+        # nothing to do with when files under a directory get created.
+        # That is, this test can't possibly work under Windows -- dircache
+        # is only good for capturing a one-shot snapshot there.
+
+        if sys.platform[:3] not in ('win', 'os2'):
             # Sadly, dircache has the same granularity as stat.mtime, and so
             # can't notice any changes that occured within 1 sec of the last
             # time it examined a directory.