Build tutorial codes together with other samples

These codes should be included into regular builds.

samples/cpp/tutorial_code/ml/non_linear_svms/non_linear_svms.cpp

@@ -9,7 +9,7 @@
 using namespace cv;
 using namespace std;
 
-void help()
+static void help()
 {
     cout<< "\n--------------------------------------------------------------------------" << endl
         << "This program shows Support Vector Machines for Non-Linearly Separable Data. " << endl