[onnx] fix building while NGRAPH_ONNXIFI_ENABLE is off (#2286)

Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

CMakeLists.txt

@@ -301,11 +301,9 @@ if (NGRAPH_ONNX_IMPORT_ENABLE)
     else()
         find_package(Protobuf 2.6.1 REQUIRED)
     endif()
-    if (NGRAPH_ONNXIFI_ENABLE)
-        include(cmake/external_onnx.cmake)
-        if (TARGET ext_protobuf)
-            add_dependencies(ext_onnx ext_protobuf)
-        endif()
+    include(cmake/external_onnx.cmake)
+    if (TARGET ext_protobuf)
+        add_dependencies(ext_onnx ext_protobuf)
     endif()
 endif()
 

src/ngraph/frontend/onnx_import/CMakeLists.txt

@@ -160,13 +160,9 @@ add_library(onnx_import STATIC
 
 set(ONNX_IMPORT_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "")
 
+add_dependencies(onnx_import_interface onnx::libonnx onnx::libonnx_proto)
 add_dependencies(onnx_import onnx_import_interface)
 
-if (NOT NGRAPH_USE_SYSTEM_PROTOBUF)
-    add_dependencies(onnx_import_interface protobuf::libprotobuf)
-    add_dependencies(onnx_import_interface onnx::libonnx_proto)
-endif()
-
 set_property(TARGET onnx_import PROPERTY POSITION_INDEPENDENT_CODE ON)
 target_include_directories(onnx_import PRIVATE ${ONNX_IMPORT_INCLUDE_DIR} ${NGRAPH_INCLUDE_PATH}
     SYSTEM PRIVATE ${ONNX_INCLUDE_DIR} ${ONNX_PROTO_INCLUDE_DIR} ${Protobuf_INCLUDE_DIR})