loongson/pypi: links for pytz

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

loongson/pypi pytz-2021.1-py3-none-any.whl
loongson/pypi pytz-2020.1-py3-none-any.whl
loongson/pypi pytz-2018.7-py3-none-any.whl
loongson/pypi pytz-2018.7-py2-none-any.whl