loongson/pypi: links for imagepy

loongson/mirror imagepy-0.22.tar.gz
loongson/mirror imagepy-0.21.tar.gz
loongson/mirror imagepy-0.18.tar.gz
loongson/mirror imagepy-0.17.tar.gz
loongson/mirror imagepy-0.16.tar.gz
loongson/mirror imagepy-0.15.tar.gz