loongson/pypi: links for scchainserverlite-6-4

loongson/mirror scchainserverlite_6_4-4.tar.gz
loongson/mirror scchainserverlite_6_4-3.tar.gz
loongson/mirror scchainserverlite_6_4-2.tar.gz
loongson/mirror scchainserverlite_6_4-1.tar.gz