dnn: eliminate IE deprecation warning

Author: alalek

modules/dnn/src/op_inf_engine.hpp

@@ -44,7 +44,7 @@
 #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__)
@@ -53,7 +53,7 @@
 #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)