loongson/mirror: links for migi

loongson/mirror migi-0.0.19.tar.gz
loongson/mirror migi-0.0.19-cp39-cp39-win32.whl
loongson/mirror migi-0.0.17.tar.gz
loongson/mirror migi-0.0.17-cp39-cp39-win32.whl
loongson/mirror migi-0.0.16.tar.gz
loongson/mirror migi-0.0.16-cp39-cp39-win32.whl