I don't think there's any point in console_*main() for non-MSVC - I think
it can't be called anyway now that SDL_main is header-only.
So I renamed those functions to main() and wmain() and made them MSVC-only
For reference, MinGW (at least the version I tested) supports both main()
and WinMain(), no matter if compiled with -mconsole or -mwindows (it seems
to prefer main() over WinMain() if both are available, in both cases).
But when building with -municode, it needs wmain() or wWinMain(), so
that case is now handled with wWinMain()
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