Drop support for discontinued DGUX

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit f487a4c1b3)

knetworkconf/backends/guess_system.sh

@@ -273,22 +273,6 @@ EOF
     m88k:*:3*:R3*)
 	echo m88k-motorola-sysv3
 	exit 0 ;;
-    AViiON:dgux:*:*)
-        # DG/UX returns AViiON for all architectures
-        UNAME_PROCESSOR=`/usr/bin/uname -p`
-	if [ $UNAME_PROCESSOR = mc88100 ] || [ $UNAME_PROCESSOR = mc88110]
-	then
-	    if [ ${TARGET_BINARY_INTERFACE}x = m88kdguxelfx ] || \
-	       [ ${TARGET_BINARY_INTERFACE}x = x ]
-	    then
-		echo m88k-dg-dgux${UNAME_RELEASE}
-	    else
-		echo m88k-dg-dguxbcs${UNAME_RELEASE}
-	    fi
-	else
-	    echo i586-dg-dgux${UNAME_RELEASE}
-	fi
- 	exit 0 ;;
     M88*:DolphinOS:*:*)	# DolphinOS (SVR3)
 	echo m88k-dolphin-sysv3
 	exit 0 ;;