loongson/mirror: links for isaacsim-extscache-kit

loongson/mirror isaacsim_extscache_kit-6.0.0.0.tar.gz
loongson/mirror isaacsim_extscache_kit-5.1.0.0.tar.gz
loongson/mirror isaacsim_extscache_kit-5.0.0.0.tar.gz
loongson/mirror isaacsim_extscache_kit-4.5.0.0.tar.gz
loongson/mirror isaacsim_extscache_kit-4.2.0.2.tar.gz
loongson/mirror isaacsim_extscache_kit-4.2.0.1.tar.gz
loongson/mirror isaacsim_extscache_kit-4.1.0.0.tar.gz
loongson/mirror isaacsim_extscache_kit-4.0.0.0.tar.gz