Add python3-devel deps
python3-devel has conditional dependencies such as:
python-rpm-macros if rpm-build
python3-rpm-generators if rpm-build
python3-rpm-macros if rpm-build
python3-setuptools if rpm-build
However, per the pungi team in RHELCMP-3719, pungi can't depsolve
those to include them in the compose because they're contingent on
rpm-build being in the transaction. We have to add them manaully.
Signed-off-by: Josh Boyer <jwboyer@redhat.com>