loongson/mirror: links for seantis-dir-roadworks

loongson/mirror seantis.dir.roadworks-1.7.3.tar.gz
loongson/mirror seantis.dir.roadworks-1.7.2.tar.gz
loongson/mirror seantis.dir.roadworks-1.7.1.tar.gz
loongson/mirror seantis.dir.roadworks-1.7.tar.gz
loongson/mirror seantis.dir.roadworks-1.5.tar.gz
loongson/mirror seantis.dir.roadworks-1.3.1.tar.gz
loongson/mirror seantis.dir.roadworks-1.3.tar.gz