loongson/pypi: links for stagger

loongson/mirror stagger-1.0.0.tar.gz
loongson/mirror stagger-0.4.2.tar.gz
loongson/mirror stagger-0.4.2-py3.1.egg
loongson/mirror stagger-0.4.1.tar.gz
loongson/mirror stagger-0.4.1-py3.1.egg
loongson/mirror stagger-0.4.0.tar.gz
loongson/mirror stagger-0.4.0-py3.1.egg