samples: suppress vtk warnings

samples/cpp/CMakeLists.txt

@@ -43,6 +43,9 @@ ocv_list_filterout(cpp_samples "real_time_pose_estimation/")
 foreach(sample_filename ${cpp_samples})
   if(sample_filename MATCHES "/viz/")
     include(${VTK_USE_FILE})
+    if(COMMAND ocv_warnings_disable)  # eliminate warnings from VTK headers (include directory is not "SYSTEM")
+      ocv_warnings_disable(CMAKE_CXX_FLAGS -Winconsistent-missing-override -Wsuggest-override)
+    endif()
   endif()
   set(package "cpp")
   if(sample_filename MATCHES "tutorial_code")