uncomment annotation

Author: JaeyoungAhn

Lib/test/test_builtin.py

@@ -1615,7 +1615,7 @@ def test_bug_27936(self):
             self.assertEqual(type(round(x, None)), type(round(x)))
 
     # TODO: RUSTPYTHON
-    # @unittest.expectedFailure
+    @unittest.expectedFailure
     def test_setattr(self):
         setattr(sys, 'spam', 1)
         self.assertEqual(sys.spam, 1)