add FIXME for mesh_group diffuse texture storage

include/mesh.h

@@ -22,6 +22,8 @@ struct mesh_info
 	glm::vec3* texture_coords; // NOTE: stay aligned with other buffers
 	uint num_indices;
 	uint* indices;
+	// FIXME: WTF? why are we storing a copy of the texture on each mesh_info
+	// 	instead of once per mesh_group?
 	util_image diffuse_texture;
 	node_animation* node_anim;
 };