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>