loongson/pypi: links for cs-env

loongson/mirror cs.env-20230407.tar.gz
loongson/mirror cs.env-20230407-py3-none-any.whl
loongson/mirror cs.env-20190103.tar.gz
loongson/mirror cs.env-20170905.1.tar.gz
loongson/mirror cs.env-20170905.tar.gz
loongson/mirror cs.env-20160828.tar.gz
loongson/mirror cs.env-20150118.tar.gz