loongson/mirror: links for simple-wbd

loongson/mirror simple_wbd-0.5.1.tar.gz
loongson/mirror simple_wbd-0.5.0.tar.gz
loongson/mirror simple_wbd-0.4.1.tar.gz
loongson/mirror simple_wbd-0.3.1.tar.gz
loongson/mirror simple_wbd-0.2.1.tar.gz
loongson/mirror simple_wbd-0.2.0.tar.gz