loongson/pypi: links for volatile

loongson/mirror volatile-2.1.0.tar.gz
loongson/mirror volatile-2.0.0.tar.gz
loongson/mirror volatile-1.2.tar.gz
loongson/mirror volatile-1.1.tar.gz
loongson/mirror volatile-1.0.tar.gz
loongson/mirror volatile-0.2.tar.gz