The fix is just to build-depend on python3-all-dev rather than python3-dev.
- Bug#903923: brotli: autopkgtest needs update for pyth... Paul Gevers
- Bug#903923: brotli: autopkgtest needs update for... Matthias Klose
- Bug#903923: Michael Hudson-Doyle
The fix is just to build-depend on python3-all-dev rather than python3-dev.