greentest.py: fix AttributeError in modulename function when using python 2.4/2.5.

--HG--
extra : transplant_source : Qb%8D%5EC%C6%F2%8D%02Pb%BAh%C6%03%1E%7E%A9%19%97

greentest/greentest.py

@@ -95,7 +95,10 @@ class TestCase(BaseTestCase):
     @property
     def modulename(self):
         test_method = getattr(self, self.testname)
-        return test_method.__func__.func_code.co_filename
+        try:
+            return test_method.__func__.func_code.co_filename
+        except AttributeError:
+            return test_method.im_func.func_code.co_filename
 
     @property
     def fullname(self):