Use *absolute* import now that it is required. (Should this go into 2.5? …

Use *absolute* import now that it is required.  (Should this go into 2.5?  Hopefully not the bogus comment about using relative imports.  That was just to see if anyone was paying attention.)

Lib/test/test_dict.py

@@ -445,7 +445,7 @@ class DictTest(unittest.TestCase):
             self.fail_("g[42] didn't raise KeyError")
 
 
-import mapping_tests
+from test import mapping_tests
 
 class GeneralMappingTests(mapping_tests.BasicTestMappingProtocol):
     type2test = dict