Fix test_os from breakage due to dict views.

BROKEN

     test_bsddb test_bsddb3 test_compile test_dumbdbm
     test_importhooks test_iter test_iterlen test_minidom test_mutants
-    test_os

Lib/test/mapping_tests.py

@@ -101,7 +101,7 @@ class BasicTestMappingProtocol(unittest.TestCase):
         #update
         p.update(self.reference)
         self.assertEqual(dict(p), self.reference)
-        items = p.items()
+        items = list(p.items())
         p = self._empty_mapping()
         p.update(items)
         self.assertEqual(dict(p), self.reference)