loongson/pypi: links for pyunit-prime

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

loongson/pypi pyunit_prime-2020.3.22.tar.gz
loongson/pypi pyunit_prime-2020.3.22-cp39-cp39-linux_loongarch64.whl
loongson/pypi pyunit_prime-2020.3.22-cp38-cp38-linux_loongarch64.whl
loongson/pypi pyunit_prime-2020.3.22-cp37-cp37m-linux_loongarch64.whl
loongson/pypi pyunit_prime-2020.3.22-cp36-cp36m-linux_loongarch64.whl