40-autologin: don't do runlevel 5 if X is absent

We can do textmode live images, after all.
Some sort of autologin would be useful there too
but doing it right is less obvious to me at the moment...

features.in/live/live/image-scripts.d/40-autologin

@@ -1,4 +1,10 @@
 #!/bin/sh -ef
+
+if [ ! -x /usr/bin/X ]; then
+	echo "warning: autologin feature requested but X not installed" >&2
+	exit 0
+fi
+
 USER=altlinux
 
 # setup runlevel