loongson/mirror: links for sobolt

loongson/mirror sobolt-0.3.1.tar.gz
loongson/mirror sobolt-0.3.0.tar.gz
loongson/mirror sobolt-0.2.0.tar.gz
loongson/mirror sobolt-0.1.4.tar.gz
loongson/mirror sobolt-0.1.3.tar.gz