loongson/pypi: links for prepack

loongson/mirror prepack-0.4.2.tar.gz
loongson/mirror prepack-0.4.1.tar.gz
loongson/mirror prepack-0.4.0.tar.gz
loongson/mirror prepack-0.3.3.tar.gz
loongson/mirror prepack-0.3.2.tar.gz
loongson/mirror prepack-0.3.1.tar.gz