loongson/pypi: links for plumiftp

loongson/mirror plumiftp-0.4.tar.gz
loongson/mirror plumiftp-0.3.tar.gz
loongson/mirror plumiftp-0.2.1.tar.gz
loongson/mirror plumiftp-0.2.tar.gz
loongson/mirror plumiftp-0.1.tar.gz