add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

external/rknpu2/examples/3rdparty/opencv/OpenCV-android-sdk/sdk/native/3rdparty/libs/arm64-v8a/liblibprotobuf.a does not exist in tree b03afb3a48717f0fdb0d2b113ff2aa0ff8cb530f