correct test_forward_reference_module_scope to xfail on older pypy

Author: altendky

tests/test_make.py

@@ -396,9 +396,10 @@ class B:
     assert_dump_load(schema=schema, loaded=loaded, dumped=dumped)
 
 
-@pytest.mark.skipif(
+@pytest.mark.xfail(
     condition=sys.implementation.name == "pypy" and sys.pypy_version_info < (7, 2),
     reason="Forward references and string annotations are broken.",
+    strict=True,
 )
 def test_forward_reference_module_scope():
     """Run the forward reference test at global scope."""