loongson/pypi: links for sxxexx

loongson/mirror sxxexx-0.5.tar.gz
loongson/mirror sxxexx-0.4.tar.gz
loongson/mirror sxxexx-0.3.tar.gz
loongson/mirror sxxexx-0.2.tar.gz
loongson/mirror sxxexx-0.1.tar.gz