loongson/pypi: links for greyt-signer

loongson/mirror GreyT-Signer-1.2.tar.gz
loongson/mirror GreyT-Signer-1.1.tar.gz
loongson/mirror GreyT-Signer-1.tar.gz
loongson/mirror GreyT_Signer-1-py3.8.egg