loongson/pypi: links for collective-portlet-existingcontent

loongson/mirror collective.portlet.existingcontent-1.0.4.tar.gz
loongson/mirror collective.portlet.existingcontent-1.0.3.tar.gz
loongson/mirror collective.portlet.existingcontent-1.0.2.tar.gz
loongson/mirror collective.portlet.existingcontent-1.0.1.tar.gz