Build tutorial codes together with other samples

These codes should be included into regular builds.

samples/cpp/tutorial_code/calib3d/stereoBM/SBM_Sample.cpp

@@ -12,7 +12,7 @@
 
 using namespace cv;
 
-char *windowDisparity = "Disparity";
+const char *windowDisparity = "Disparity";
 
 void readme();