loongson/pypi: links for xbcfg

loongson/mirror xbcfg-0.5.tar.gz
loongson/mirror xbcfg-0.4.tar.gz
loongson/mirror xbcfg-0.3.tar.gz
loongson/mirror xbcfg-0.2.tar.gz
loongson/mirror xbcfg-0.1.tar.gz