loongson/pypi: links for ptool

loongson/mirror ptool-0.8.tar.gz
loongson/mirror ptool-0.7.tar.gz
loongson/mirror ptool-0.6.tar.gz
loongson/mirror ptool-0.5.tar.gz
loongson/mirror ptool-0.4.tar.gz
loongson/mirror ptool-0.3.tar.gz