Fix for animation possible offset in sequencer.

BKE_scene_update_for_newframe should be called before RE_BlenderFrame in
seq_render_scene_strip. It's not entirely nice, but bot sure about better
solution for now.

source/blender/blenkernel/intern/sequencer.c

@@ -2418,6 +2418,7 @@ static ImBuf *seq_render_scene_strip(SeqRenderData context, Sequence *seq, float
 			if (re == NULL)
 				re = RE_NewRender(scene->id.name);
 			
+			BKE_scene_update_for_newframe(context.bmain, scene, scene->lay);
 			RE_BlenderFrame(re, context.bmain, scene, NULL, camera, scene->lay, frame, FALSE);
 
 			/* restore previous state after it was toggled on & off by RE_BlenderFrame */