getting-started: Add missing system dependencies for tests
Without this dependency, the pifpaf tests won't execute. They will fail with a cryptic error.
That cryptic error message is currently fixed by pifpaf's author. It's pending in a PR and should soon land.
Related swh/meta$339 Related https://github.com/jd/pifpaf/issues/108 Related https://github.com/jd/pifpaf/pull/119
Migrated from D884 (view on Phabricator)