loongson/pypi: links for bitbucket

loongson/mirror BitBucket-0.4a.tar.gz
loongson/mirror BitBucket-0.3c.tar.gz
loongson/mirror BitBucket-0.3b.tar.gz
loongson/mirror BitBucket-0.3a.tar.gz
loongson/mirror BitBucket-0.2b.tar.gz
loongson/mirror BitBucket-0.3e.tar.gz
loongson/mirror BitBucket-0.3d.tar.gz