Special support for pickling os.stat and os.stat_vfs results portably
(the types come from different modules on different platforms).

Added tests for pickling these types.

May be a bugfix candidate.
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
index e2d2580..e16428f 100644
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -254,6 +254,17 @@
         s = self.dumps(t)
         u = self.loads(s)
         self.assertEqual(t, u)        
+        import os
+        if hasattr(os, "stat"):
+            t = os.stat(os.curdir)
+            s = self.dumps(t)
+            u = self.loads(s)
+            self.assertEqual(t, u)
+        if hasattr(os, "statvfs"):
+            t = os.statvfs(os.curdir)
+            s = self.dumps(t)
+            u = self.loads(s)
+            self.assertEqual(t, u)
 
 class AbstractPickleModuleTests(unittest.TestCase):