loongson/mirror: links for siegert-scatter

loongson/mirror siegert_scatter-1.0.0.tar.gz
loongson/mirror siegert_scatter-1.0.0-py3-none-any.whl
loongson/mirror siegert_scatter-0.2.0.tar.gz
loongson/mirror siegert_scatter-0.2.0-py3-none-any.whl