gh-90473: Make chmod a dummy on WASI, skip chmod tests (GH-93534)

WASI does not have the ``chmod(2)`` syscall yet.

Lib/test/test_py_compile.py

@@ -119,6 +119,7 @@ def test_relative_path(self):
                      'non-root user required')
     @unittest.skipIf(os.name == 'nt',
                      'cannot control directory permissions on Windows')
+    @os_helper.skip_unless_working_chmod
     def test_exceptions_propagate(self):
         # Make sure that exceptions raised thanks to issues with writing
         # bytecode.