COMP: fixed comp. of other tests when OTB_USE_LIBSVM and OTB_USE_OPENCV are turned off

...arning/Supervised/test/otbMachineLearningModelCanRead.cxx

Modules/Learning/Supervised/test/otbSupervisedTestDriver.cxx

...Learning/Supervised/test/otbTrainMachineLearningModel.cxx