4efb13f845
GUEST_VIRTIO_MMIO_* was added in Xen 4.17, so only define them for CONFIG_XEN_CTRL_INTERFACE_VERSIONs up to 4.16. Reported-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>