I'm not sure about your compilation errors, but once you get those sorted out (and for the benefit of anybody else wondering how to do this), here's how I changed the keybindings to make fullscreen work in 4.0.26 super.
Open 4coder_generated/remapping.h and modify line 31 to use some other keybinding, for example:
bind(context, key_f11, MDFR_CTRL, toggle_fullscreen);
That and a rebuild did the trick for me, I can now press ctrl+F11 to toggle fullscreen mode. I believe this still leaves F11 free for build commands, and even though this file is in the 4coder_generated
folder, it does not appear to actually be generated by anything. (Correct me if I'm wrong Allen.)
Note that this is for Windows, for Mac you'll need to modify line 187.
Hope that helps!