loongson/mirror: links for r-prj

loongson/mirror R-Prj-0.5.6.tar.gz
loongson/mirror R-Prj-0.5.5.tar.gz
loongson/mirror R-Prj-0.5.4.tar.gz
loongson/mirror R-Prj-0.5.3.3.tar.gz
loongson/mirror R-Prj-0.5.3.2.tar.gz
loongson/mirror R-Prj-0.5.2.tar.gz