Update 'build-deluge.jenkins'

dns ip validation needs to be forced to use ipv4

build-deluge.jenkins

@@ -57,7 +57,7 @@ if [[ -z "\${DDNS_HOST}" ]] || [[ "\${DDNS_HOST}" == "" ]]; then
 	exit 100
 fi
 
-DIP=\$(dig @ns1.google.com TXT o-o.myaddr.l.google.com +short | sed -e 's/"//g')
+DIP=\$(dig -4 @ns1.google.com TXT o-o.myaddr.l.google.com +short | sed -e 's/"//g')
 if [[ -z "\${DIP+x}" ]] || [[ "\${DIP}" == "" ]]; then
 	printf '%s\\n' "Unable to detect real-world IP."
 	exit 100