loongson/pypi: links for btrfs

loongson/mirror btrfs-15.tar.gz
loongson/mirror btrfs-14.1.tar.gz
loongson/mirror btrfs-13.tar.gz
loongson/mirror btrfs-11.tar.gz
loongson/mirror btrfs-10.tar.gz
loongson/mirror btrfs-9.1.tar.gz
loongson/mirror btrfs-9.tar.gz
loongson/mirror btrfs-8.tar.gz
loongson/mirror btrfs-7.tar.gz
loongson/mirror btrfs-5.tar.gz
loongson/mirror btrfs-0.3.tar.gz
loongson/mirror btrfs-0.2.1.tar.gz
loongson/mirror btrfs-0.1.tar.gz