loongson/mirror: links for pyxl3

loongson/mirror pyxl3-1.4.tar.gz
loongson/mirror pyxl3-1.3.tar.gz
loongson/mirror pyxl3-1.2.tar.gz
loongson/mirror pyxl3-1.1.tar.gz
loongson/mirror pyxl3-1.0.tar.gz