loongson/pypi: links for cs-app-flag

loongson/mirror cs.app.flag-20201228.tar.gz
loongson/mirror cs.app.flag-20190729.tar.gz
loongson/mirror cs.app.flag-20190220.tar.gz
loongson/mirror cs.app.flag-20181109.tar.gz
loongson/mirror cs.app.flag-20170906.2.tar.gz
loongson/mirror cs.app.flag-20170906.1.tar.gz
loongson/mirror cs.app.flag-20170906.tar.gz
loongson/mirror cs.app.flag-20170905.tar.gz