Remove local libgsupclient; Use libosmo-gsup-client from osmo-hlr

osmo-hlr has recently (as of Change-Id
Iad227bb477d64da30dd6bfbbe1bd0c0a55be9474) a working shared library
implementation of libosmo-gsup-client.

We can remove the local implementation in osmo-sgsn and use the
system-installed shared library instead.

Change-Id: I6f542945403cf2e3ddac419186b09ec0e2d43b69
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index d873ee9..64663d6 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -28,6 +28,7 @@
 osmo-build-dep.sh libosmo-abis
 osmo-build-dep.sh libosmo-netif
 osmo-build-dep.sh osmo-ggsn
+osmo-build-dep.sh osmo-hlr
 
 enable_werror=""
 if [ "x$IU" = "x--enable-iu" ]; then