Build tutorial codes together with other samples

These codes should be included into regular builds.

samples/cpp/tutorial_code/ImgProc/BasicLinearTransforms.cpp

@@ -4,8 +4,7 @@
  * @author OpenCV team
  */
 
-#include <cv.h>
-#include <highgui.h>
+#include "opencv2/highgui/highgui.hpp"
 #include <iostream>
 
 using namespace cv;
@@ -17,7 +16,7 @@ int beta;  /**< Simple brightness control */
  * @function main
  * @brief Main function
  */
-int main( int argc, char** argv )
+int main( int, char** argv )
 {
    /// Read image given by user
    Mat image = imread( argv[1] );