loongson/pypi: links for positivesum

loongson/mirror positivesum-0.1.4dev.tar.gz
loongson/mirror positivesum-0.1.3dev.tar.gz
loongson/mirror positivesum-0.1.2dev.tar.gz
loongson/mirror positivesum-0.1.1dev.tar.gz
loongson/mirror positivesum-0.1dev.tar.gz