loongson/pypi: links for planarity

loongson/mirror planarity-0.6.tar.gz
loongson/mirror planarity-0.5.tar.gz
loongson/mirror planarity-0.4.1.zip
loongson/mirror planarity-0.4.1.tar.gz
loongson/mirror planarity-0.4.zip
loongson/mirror planarity-0.4.tar.gz
loongson/mirror planarity-0.3.1.zip
loongson/mirror planarity-0.3.1.tar.gz
loongson/mirror planarity-0.3.zip
loongson/mirror planarity-0.3.tar.gz