Hello Guix,

This fixes a problem building python2-tempest-lib due to missing
propagation of python2-functools32.

Note that the native-inputs are still referenced due to a bug with how
the automatic wrapper of $out/bin works. Should they still be added as
regular inputs, or can we ignore it for now? I *think* this is fixed in
wip-python-build-system, but haven't checked yet (still building
dependents).