loongson/pypi: links for chkcrontab

loongson/mirror chkcrontab-1.7.tar.gz
loongson/mirror chkcrontab-1.6.3.tar.gz
loongson/mirror chkcrontab-1.6.2.tar.gz
loongson/mirror chkcrontab-1.6.tar.gz
loongson/mirror chkcrontab-1.5.1.tar.gz
loongson/mirror chkcrontab-1.5.tar.gz
loongson/mirror chkcrontab-1.3.tar.gz
loongson/mirror chkcrontab-1.2.tar.gz
loongson/mirror chkcrontab-1.1.tar.gz