sdlLround function
extern DECLSPEC long SDLCALL SDL_lround(double x)
Implementation
int sdlLround(double x) {
  final sdlLroundLookupFunction =
      libSdl2.lookupFunction<Int32 Function(Double x), int Function(double x)>(
          'SDL_lround');
  return sdlLroundLookupFunction(x);
}