loongson/pypi: links for pycrypto

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

loongson/pypi pycrypto-2.6.1.tar.gz
loongson/pypi pycrypto-2.6.1-cp38-cp38-linux_loongarch64.whl
loongson/pypi pycrypto-2.6.1-cp37-cp37m-linux_loongarch64.whl
loongson/pypi pycrypto-2.6.1-cp36-cp36m-linux_loongarch64.whl
loongson/pypi pycrypto-2.6.1-cp27-cp27mu-linux_loongarch64.whl