loongson/mirror: links for labelmerge

loongson/mirror labelmerge-0.4.7.tar.gz
loongson/mirror labelmerge-0.4.7-py3-none-any.whl
loongson/mirror labelmerge-0.4.6.tar.gz
loongson/mirror labelmerge-0.4.6-py3-none-any.whl