Removed SDL_RENDERER_ACCELERATED and SDL_RENDERER_SOFTWARE

These flags are unnecessary and have always been a source of confusion.

src/render/SDL_sysrender.h

@@ -220,6 +220,7 @@ struct SDL_Renderer
 
     /* The current renderer info */
     SDL_RendererInfo info;
+    SDL_bool software;
 
     /* The window associated with the renderer */
     SDL_Window *window;