loongson/pypi: links for mp3norm

loongson/mirror mp3norm-0.6.tar.gz
loongson/mirror mp3norm-0.5.tar.gz
loongson/mirror mp3norm-0.4.tar.gz
loongson/mirror mp3norm-0.3.tar.gz
loongson/mirror mp3norm-0.2.tar.gz
loongson/mirror mp3norm-0.1.tar.gz