TST: Fix condition for test_tmpconfigdir_warning

This checks `os.geteuid`, but this is only available on Unix, not
Emscripten or WASM.

Author: QuLogic

lib/matplotlib/tests/test_matplotlib.py

@@ -18,9 +18,9 @@ def test_parse_to_version_info(version_str, version_tuple):
     assert matplotlib._parse_to_version_info(version_str) == version_tuple
 
 
-@pytest.mark.skipif(sys.platform == "win32",
-                    reason="chmod() doesn't work as is on Windows")
-@pytest.mark.skipif(sys.platform != "win32" and os.geteuid() == 0,
+@pytest.mark.skipif(sys.platform not in ["linux", "darwin"],
+                    reason="chmod() doesn't work on this platform")
+@pytest.mark.skipif(sys.platform in ["linux", "darwin"] and os.geteuid() == 0,
                     reason="chmod() doesn't work as root")
 def test_tmpconfigdir_warning(tmp_path):
     """Test that a warning is emitted if a temporary configdir must be used."""