osmo-sgsn: Depend on osmo-hlr

Since osmo-sgsn f4b2c4ca42cc530c38c9ac6f275e4d7da9315fa2, it depends on
libosmo-gsup-client available in osmo-hlr.

Change-Id: I44ce22d6c4b532b159fbdc7d5494830673db2509
1 file changed