Mark failing tests as xfail. Ref #4864.

Author: jaraco

setuptools/tests/config/test_setupcfg.py

@@ -422,6 +422,7 @@ def test_not_utf8(self, tmpdir):
             with get_dist(tmpdir):
                 pass
 
+    @pytest.mark.xfail(reason="#4864")
     def test_warn_dash_deprecation(self, tmpdir):
         # warn_dash_deprecation() is a method in setuptools.dist
         # remove this test and the method when no longer needed
@@ -439,6 +440,7 @@ def test_warn_dash_deprecation(self, tmpdir):
         assert metadata.author_email == '[email protected]'
         assert metadata.maintainer_email == '[email protected]'
 
+    @pytest.mark.xfail(reason="#4864")
     def test_make_option_lowercase(self, tmpdir):
         # remove this test and the method make_option_lowercase() in setuptools.dist
         # when no longer needed