loongson/pypi: links for svargaext-sqlamigrate

loongson/mirror svargaext.sqlamigrate-0.4.tar.gz
loongson/mirror svargaext.sqlamigrate-0.3.tar.gz
loongson/mirror svargaext.sqlamigrate-0.2.tar.gz
loongson/mirror svargaext.sqlamigrate-0.1.tar.gz