or, in the case of AF.cpp, at least comment on them
I think this fixes most of the remaining "interesting" GCC 12 on Linux
warnings, except for some in idParser::ExpandBuiltinDefine() that I'll
fix in the next commit
Don't include the lazy precompiled.h everywhere, only what's
required for the compilation unit.
platform.h needs to be included instead to provide all essential
defines and types.
All includes use the relative path to the neo or the game
specific root.
Move all idlib related includes from idlib/Lib.h to precompiled.h.
precompiled.h still exists for the MFC stuff in tools/.
Add some missing header guards.
