oneTBB (oneAPI Threading Building Blocks): https://github.com/uxlfoundation/oneTBB

Vendored as a plain git tree of release tag v2023.0.0:
> git clone --depth 1 --branch v2023.0.0 https://github.com/uxlfoundation/oneTBB.git oneTBB
> rm -rf oneTBB/.git oneTBB/.github
# to update: repeat with a newer tag into a fresh oneTBB/ dir

Previously (Intel TBB 2020.2, OpenModelica GC-patched fork):
> git subtree add --prefix tbb https://github.com/mahge/tbb.git tbb_om_boehm_gc
