Merge pull request #3826 from mshabunin:cleanup-core

C-API cleanup: removed obsolete apps from xobjdetect

Author: asmorkalov

modules/ml/src/gbt.cpp

@@ -31,7 +31,5 @@ endfunction()
 
 
 add_subdirectory(waldboost_detector)
-# add_subdirectory(traincascade)
-# add_subdirectory(createsamples)
 add_subdirectory(annotation)
-add_subdirectory(visualisation)
+add_subdirectory(visualisation)