loongson/pypi: links for webplatform-backend

loongson/mirror webplatform-backend-1.0.5.tar.gz
loongson/mirror webplatform-backend-1.0.4.tar.gz
loongson/mirror webplatform_backend-1.0.4-py3.7.egg
loongson/mirror webplatform-backend-1.0.3.tar.gz
loongson/mirror webplatform-backend-1.0.2.tar.gz
loongson/mirror webplatform-backend-1.0.1.tar.gz
loongson/mirror webplatform-backend-1.0.0.tar.gz