Fixed unused tracking for OpenCV 2.x

AlexeyAB

2018-01-11 5424987dd11a3e3d968cbcf625bdfc0bb42e6fc6

 src/cost_layer.h

@@ -1,7 +1,7 @@
#ifndef COST_LAYER_H
#define COST_LAYER_H
#include "params.h"
#include "layer.h"
#include "network.h"

typedef layer cost_layer;