fwupd cannot be cross built from source, because its dependency on
python3-pefile is not satisfiable. In general, Architecture: all
packages can never satisfy cross Build-Depends unless marked Multi-Arch:
foreign or annotated :native. Since python3-pefile is a pure Python
module with no non-stdlib dependencies, it can be marked Multi-Arch:
foreign. I'm attaching a patch for your convenience.

Helmut