descent / svgalib-1

It's not svgalib "dash" 1, it's svgalib negative 1, because if you still use this library there's probably something wrong with you. That said, this is a 'fork' of the most recent (haha) version found on the internets, with a ton of patches from various people around the internet cobbled together. I have not and will not make any outlandish efforts to credit people, but if you see something here you wrote and you want credit, message me. Should fix a lot of compiling issues under recent issues of Linux.