loongson/mirror: links for xxtea-py

loongson/mirror xxtea-py-1.0.3.tar.gz
loongson/mirror xxtea_py-1.0.3-py3-none-any.whl
loongson/mirror xxtea_py-1.0.3-py2-none-any.whl
loongson/mirror xxtea-py-1.0.2.tar.gz