CMake platform files for old and/or obscure platforms.

These are as-is and are giant hacks and will not support all features. Please use them sensibly. I'm not responsible for anything that happens if you use this.

cc65.cmake: Use cc65 to build commodore64 executables opentatcom-dos.cmake: Use OpenWatcom 2 to compile a 486 DOS executable with a dos4gw loader

I had these files in various projects. I wanted to keep them safe somewhere so I don't have to fiddle around with all the commandline arguments if I need it again.