loongson/pypi: links for cs-app-portfwd

loongson/mirror cs.app.portfwd-20221228.tar.gz
loongson/mirror cs.app.portfwd-20221228-py3-none-any.whl
loongson/mirror cs.app.portfwd-20210316.tar.gz
loongson/mirror cs.app.portfwd-20190602.tar.gz
loongson/mirror cs.app.portfwd-20170906.tar.gz