loongson/pypi: links for xcproxy

loongson/mirror xcproxy-4.3.88.tar.gz
loongson/mirror xcproxy-4.0.tar.gz
loongson/mirror xcproxy-3.0.1.tar.gz
loongson/mirror xcproxy-2.0.4.tar.gz
loongson/mirror xcproxy-2.0.2.tar.gz
loongson/mirror xcproxy-2.0.1.tar.gz
loongson/mirror xcproxy-1.0.3.tar.gz