loongson/pypi: links for layout

loongson/mirror layout-0.4.1.tar.gz
loongson/mirror layout-0.4.0.tar.gz
loongson/mirror layout-0.2.5.tar.gz
loongson/mirror layout-0.2.4.tar.gz
loongson/mirror layout-0.2.3.tar.gz
loongson/mirror layout-0.2.1.tar.gz