Install autoconf 2.71 in the docker image. Upstream libffi requires autoconf 2.71, so we should try to use it too.
queries:
  - exclude: py/import-and-import-from

extraction:
  cpp:
    prepare:
      packages:
        - python3-yaml

queries:
  - exclude: py/import-and-import-from

extraction:
  cpp:
    prepare:
      packages:
        - python3-yaml
