I'm no expert, but I'm going to try and help out here.. so, I think you could just go to where it says it's first defined and delete it there.. then if you have errors, you could need to include the files where they are newly defined in the ones that were first defined.
So:
1. #include the file where you newly defined it in..
example:
Delete "renderamt" definition in video_hardware_surface. Then at the top of video_hardware_surface use "#include video_hardware_warp" because video_hardware_surface is one where you are having problems.
2. Do that for all of those errors, and compile... This just might work.
I'm newish to QuakeC and Quake engine coding. So somebody correct me if I'm wrong please..
