configure: Prettify message for hosts without spice support

Instead of

    spice support     no (/)

configure now prints

    spice support     no

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/configure b/configure
index 8689435..ff72ee3 100755
--- a/configure
+++ b/configure
@@ -4107,7 +4107,11 @@
 echo "vhost-scsi support $vhost_scsi"
 echo "Trace backend     $trace_backend"
 echo "Trace output file $trace_file-<pid>"
+if test "$spice" = "yes"; then
 echo "spice support     $spice ($spice_protocol_version/$spice_server_version)"
+else
+echo "spice support     $spice"
+fi
 echo "rbd support       $rbd"
 echo "xfsctl support    $xfs"
 echo "nss used          $smartcard_nss"