use the new-style headers in the samples to improve OpenCV build time.

samples/c/pyramid_segmentation.c

@@ -1,14 +1,5 @@
-#ifdef _CH_
-#pragma package <opencv>
-#endif
-
-#define CV_NO_BACKWARD_COMPATIBILITY
-
-#ifndef _EiC
-#include "cv.h"
-#include "highgui.h"
-#include <math.h>
-#endif
+#include "opencv2/imgproc/imgproc.hpp"
+#include "opencv2/highgui/highgui.hpp"
 
 IplImage*  image[2] = { 0, 0 }, *image0 = 0, *image1 = 0;
 CvSize size;