add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

prebuilts/gcc/linux-x86/aarch64/gcc-arm-10.3-2021.07-x86_64-aarch64-none-linux-gnu/aarch64-none-linux-gnu/lib64/libstdc++.a does not exist in tree b03afb3a48717f0fdb0d2b113ff2aa0ff8cb530f