loongson/mirror: links for xmastree

loongson/mirror xmastree-0.0.5a.tar.gz
loongson/mirror xmastree-0.0.4.tar.gz
loongson/mirror xmastree-0.0.3.tar.gz
loongson/mirror xmastree-0.0.2.tar.gz
loongson/mirror xmastree-0.0.1.tar.gz