Fix qemu packaging conditionals for ELN builds
    
    In ELN builds %{rhel} is defined and %{fedora} is unset
    
    This causes EDK to assume the RHEL qemu-kvm packaging scheme.
    
    This is invalid for ELN, however, because it still follows the
    Fedora packaging scheme for QEMU.
    
    Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>