loongson/pypi: links for protlib

loongson/mirror protlib-1.5.0.tar.gz
loongson/mirror protlib-1.4.tar.gz
loongson/mirror protlib-1.3.tar.gz
loongson/mirror protlib-1.2.tar.gz
loongson/mirror protlib-1.1.tar.gz
loongson/mirror protlib-1.0.tar.gz