loongson/mirror: links for plc800stg

loongson/mirror plc800stg-0.0.5.tar.gz
loongson/mirror plc800stg-0.0.4.tar.gz
loongson/mirror plc800stg-0.0.3.tar.gz
loongson/mirror plc800stg-0.0.2.tar.gz
loongson/mirror plc800stg-0.0.1.tar.gz