Headers are literal copy paste, and are entirely different. Anyone who has ever had to define WIN32_LEAN_AND_MEAN knows that there's _way_ more going on here.
Yes, the number of times I've had a `LoadLibrary` function name conflict with `windows.h`'s `A`/`W` suffix-switching or had to deal with X11's `#define Status int` "typedef" mucking with completely unrelated code is…sad.
