tests: xfail a non-important test (#107)

Helps conda.

Signed-off-by: Henry Schreiner <[email protected]>

Author: henryiii

tests/test_builder.py

@@ -48,6 +48,9 @@ def test_get_python_include_dir():
     assert get_python_include_dir().is_dir()
 
 
+@pytest.mark.xfail(
+    strict=False, reason="Doesn't matter if this fails, usually not used"
+)
 def test_get_python_library():
     pprint.pprint(sysconfig.get_config_vars())