Ignore Py_DEBUG is unset warning

This warning may happen on Windows and it seems to be present in the
original `pypa/wheel` implementation.

Author: abravalheri

setuptools/tests/test_bdist_wheel.py

@@ -362,6 +362,8 @@ def test_build_number(dummy_dist, monkeypatch, tmp_path):
 """
 
 
+@pytest.mark.filterwarnings("ignore:Config variable 'Py_DEBUG' is unset.*")
+# ^-- Warning may happen in Windows (inherited from original pypa/wheel implementation)
 def test_limited_abi(monkeypatch, tmp_path, tmp_path_factory):
     """Test that building a binary wheel with the limited ABI works."""
     proj_dir = tmp_path_factory.mktemp("dummy_dist")