ENH: limit the required opencv modules

Code/UtilitiesAdapters/OpenCVAdapters/otbNeuralNetworkMachineLearningModel.h

@@ -18,6 +18,9 @@
 #ifndef __otbNeuralNetworkMachineLearningModel_h
 #define __otbNeuralNetworkMachineLearningModel_h
 
+#include <opencv2/core/core_c.h>
+#include <opencv2/core/core.hpp>
+#include <opencv2/ml/ml.hpp>
 #include "itkLightObject.h"
 #include "itkFixedArray.h"
 #include "otbMachineLearningModel.h"