debian: remove obsolete dependency

This should fix package build for latest Ubuntu.

Change-Id: I132515cd4d89132bb59f9ee7804a5a50e8bd2775
diff --git a/debian/control b/debian/control
index 766d015..571c24e 100644
--- a/debian/control
+++ b/debian/control
@@ -13,8 +13,7 @@
                libosmo-abis-dev,
                libosmo-netif-dev,
                libdbd-sqlite3,
-               libsqlite3-dev,
-               hardening-wrapper
+               libsqlite3-dev
 Standards-Version: 3.9.6
 Vcs-Browser: http://cgit.osmocom.org/osmo-hlr
 Vcs-Git: git://git.osmocom.org/osmo-hlr