message: fix cmake warning message
diff: @@ -274,7 +274,10 @@ endif()
  # Export include directories
  set(ONNX_INCLUDE_DIRS "${ONNX_ROOT}" "${CMAKE_CURRENT_BINARY_DIR}")
  +get_directory_property(hasParent PARENT_DIRECTORY)
  +if(hasParent)
  set(ONNX_INCLUDE_DIRS ${ONNX_INCLUDE_DIRS} PARENT_SCOPE)
  +endif()
  if (MSVC)
  target_compile_options(onnx_proto PRIVATE
  