message: Support defined ONNX_ML in parent cmake files
diff: @@ -24,12 +24,14 @@ option(ONNX_COVERAGE "Build with coverage instrumentation" OFF)
  option(ONNX_BUILD_TESTS "Build ONNX C++ APIs Tests" OFF)
  option(ONNX_USE_LITE_PROTO "Use lite protobuf instead of full." OFF)
  option(ONNXIFI_ENABLE_EXT "Enable onnxifi extensions." OFF)
  +if(NOT DEFINED ONNX_ML)
  if(DEFINED ENV{ONNX_ML})
  set(DEFAULT_ONNX_ML $ENV{ONNX_ML})
  else()
  set(DEFAULT_ONNX_ML ON)
  endif()
  option(ONNX_ML "Enable traditional ML API." ${DEFAULT_ONNX_ML})
  +endif()
  option(ONNXIFI_DUMMY_BACKEND "Use dummy backend in onnxifi test driver." OFF)
  # Set C++11 as standard for the whole project
  