remove for bad-level-call & some minor changes to make camera switching neater.

source/blender/render/intern/source/pipeline.c

@@ -2584,11 +2584,7 @@ static void do_render_seq(Render * re)
 /* main loop: doing sequence + fields + blur + 3d render + compositing */
 static void do_render_all_options(Render *re)
 {
-#ifdef DURIAN_CAMERA_SWITCH
-	Object *camera= scene_find_camera_switch(re->scene);
-	if(camera)
-		re->scene->camera= camera;
-#endif
+	scene_camera_switch_update(re->scene);
 
 	re->i.starttime= PIL_check_seconds_timer();