Merge tag 'for-upstream-urgent' of https://gitlab.com/bonzini/qemu into staging

Merge tag 'for-upstream-urgent' of https://gitlab.com/bonzini/qemu into staging

Fixes for Python venv changes

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* tag 'for-upstream-urgent' of https://gitlab.com/bonzini/qemu:
  scripts: make sure scripts are invoked via $(PYTHON)
  gitlab: custom-runners: preserve more artifacts for debugging
  mkvenv: pass first missing package to diagnose()
  configure: fix backwards-compatibility for meson sphinx_build option
  build: rebuild build.ninja using "meson setup --reconfigure"
  mkvenv: replace distlib.database with importlib.metadata/pkg_resources
  remove remaining traces of meson submodule

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>