loongson/pypi: links for birdback

loongson/mirror birdback-0.2.tar.gz
loongson/mirror birdback-0.1.tar.gz
loongson/mirror birdback-0.1b5.tar.gz
loongson/mirror birdback-0.1b4.tar.gz
loongson/mirror birdback-0.1b3.tar.gz
loongson/mirror birdback-0.1b2.tar.gz