loongson/pypi: links for products-maildrophost

loongson/mirror Products.MaildropHost-2.3.tar.gz
loongson/mirror Products.MaildropHost-2.2.tar.gz
loongson/mirror Products.MaildropHost-2.1.tar.gz
loongson/mirror Products.MaildropHost-2.0.tar.gz