Implemented SDL_RenderReadPixels()/SDL_RenderWritePixels() for the dummy renderer. This is helpful to validate the automated test suite, since this renderer is super simple and should always pass tests.

/*
 *  jumphack.h
 *  SDLiPhoneOS
 *
 */

#ifndef _jumphack_h
#define _jumphack_h

#include "setjmp.h"

/* see SDL_uikitevents.m for more info */

extern jmp_buf *jump_env();

#endif