loongson/pypi: links for precursor

loongson/mirror precursor-1.2.4.tar.gz
loongson/mirror precursor-1.2.2.tar.gz
loongson/mirror precursor-1.2.1.tar.gz
loongson/mirror precursor-1.2.tar.gz
loongson/mirror precursor-1.1.tar.gz
loongson/mirror precursor-1.0dev.tar.gz