loongson/pypi: links for calc20

loongson/mirror calc20-0.0.5.tar.gz
loongson/mirror calc20-0.0.4.tar.gz
loongson/mirror calc20-0.0.3.tar.gz
loongson/mirror calc20-0.0.2.tar.gz
loongson/mirror calc20-0.0.1.tar.gz