loongson/mirror: links for pp7stubs

loongson/mirror pp7stubs-7.16.2.tar.gz
loongson/mirror pp7stubs-7.16.2-py3-none-any.whl
loongson/mirror pp7stubs-1.0.tar.gz
loongson/mirror pp7stubs-1.0-py3-none-any.whl