loongson/pypi: links for msgpack-python

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

loongson/pypi msgpack_python-0.5.6-cp37-cp37m-linux_loongarch64.whl
loongson/pypi msgpack_python-0.5.6-cp27-cp27mu-linux_loongarch64.whl
loongson/pypi msgpack-python-0.4.8.tar.gz
loongson/pypi msgpack_python-0.4.8-cp39-cp39-linux_loongarch64.whl
loongson/pypi msgpack_python-0.4.8-cp38-cp38-linux_loongarch64.whl
loongson/pypi msgpack_python-0.4.8-cp37-cp37m-linux_loongarch64.whl
loongson/pypi msgpack_python-0.4.8-cp36-cp36m-linux_loongarch64.whl