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>