[libcxx-commits] [libcxx] [libcxx][test] preserve QEMU_* vars (PR #223317)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 requested changes to this pull request.

If your environment has special needs you're supposed to replace `run.py` with your own script, like `adb_run.py`.

https://github.com/llvm/llvm-project/pull/223317