message: dnn: eliminate IE deprecation warning
diff: #pragma GCC diagnostic ignored "-Wsuggest-override"
  #endif
  -#ifdef HAVE_DNN_IE_NN_BUILDER_2019
  +#if defined(HAVE_DNN_IE_NN_BUILDER_2019) || INF_ENGINE_VER_MAJOR_EQ(INF_ENGINE_RELEASE_2020_4)
  //#define INFERENCE_ENGINE_DEPRECATED // turn off deprecation warnings from IE
  //there is no way to suppress warnings from IE only at this moment, so we are forced to suppress warnings globally
  #if defined(__GNUC__)
  #ifdef _MSC_VER
  #pragma warning(disable: 4996) // was declared deprecated
  #endif
  -#endif // HAVE_DNN_IE_NN_BUILDER_2019
  +#endif
  #if defined(__GNUC__) && INF_ENGINE_VER_MAJOR_LT(INF_ENGINE_RELEASE_2020_1)
  #pragma GCC visibility push(default)
  