Use value string check from osmo-ci

Change-Id: I513835be2d931d0a931cdfc996f361a451bc1a15
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index 6a72840..4a26776 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -1,8 +1,9 @@
-#!/usr/bin/env bash
+#!/bin/sh
+# jenkins build helper script for libosmo-sccp.  This is how we build on jenkins.osmocom.org
 
 set -ex
 
-./contrib/verify_value_string_arrays_are_terminated.py $(find . -name "*.[hc]")
+verify_value_string_arrays_are_terminated.py $(find . -name "*.[hc]")
 
 if [ "x$label" = "xFreeBSD_amd64" ]; then
         ENABLE_SANITIZE=""