Removed obsolete documentation that shows this usage and macros that attempt it. Also allow SDL_FUNCTION to be redefined by the application. Fixes https://github.com/libsdl-org/SDL/issues/15004
Removed obsolete documentation that shows this usage and macros that attempt it. Also allow SDL_FUNCTION to be redefined by the application. Fixes https://github.com/libsdl-org/SDL/issues/15004