loongson/pypi: links for csspin

loongson/mirror csspin-3.0.0-py3-none-any.whl
loongson/mirror csspin-2.0.2-py3-none-any.whl
loongson/mirror csspin-2.0.1-py3-none-any.whl
loongson/mirror csspin-2.0.0-py3-none-any.whl