loongson/pypi: links for cmsplugin-pdf

loongson/mirror cmsplugin-pdf-0.5.1.tar.gz
loongson/mirror cmsplugin-pdf-0.4.tar.gz
loongson/mirror cmsplugin-pdf-0.3.1.tar.gz
loongson/mirror cmsplugin-pdf-0.3.tar.gz
loongson/mirror cmsplugin-pdf-0.2.tar.gz