Remove the __builtin__ compatibility

test/test_api/test_keyword.py

@@ -45,7 +45,7 @@ def test_keyword_attributes(Script):
     assert def_.full_name is None
     assert def_.line is def_.column is None
     assert def_.in_builtin_module() is True
-    assert def_.module_name in ('builtins', '__builtin__')
+    assert def_.module_name == 'builtins'
     assert 'typeshed' in def_.module_path
     assert def_.type == 'keyword'