Don't link SysV init script if $SERVICEDIR is given on Debian.

- Fixes issue with package build environment.

Signed-off-by: Tom Eastep <teastep@shorewall.net>

Shorewall-init/install.sh

@@ -585,7 +585,7 @@ if [ -z "$DESTDIR" ]; then
     fi
 else
     if [ $configure -eq 1 -a -n "$first_install" ]; then
-	if [ $HOST = debian ]; then
+	if [ $HOST = debian -a -z "$SERVICEDIR" ]; then
 	    if [ -n "${DESTDIR}" ]; then
 		mkdir -p ${DESTDIR}/etc/rcS.d
 	    fi