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

Lib/test/support/os_helper.py

Lib/test/test_argparse.py

Lib/test/test_dbm_dumb.py

Lib/test/test_import/__init__.py

Lib/test/test_netrc.py

Lib/test/test_os.py

Lib/test/test_pathlib.py

Lib/test/test_posix.py

Lib/test/test_posixpath.py

Lib/test/test_py_compile.py

Lib/test/test_pydoc.py

Lib/test/test_shutil.py

Lib/test/test_stat.py

Lib/test/test_tarfile.py

Lib/test/test_tempfile.py

Lib/test/test_uu.py

Lib/test/test_zipapp.py

.../next/Tests/2022-06-05-10-16-45.gh-issue-90473.QMu7A8.rst

Modules/posixmodule.c

Tools/wasm/config.site-wasm32-wasi