contrib: build-osmo-sgsn: Depend on osmo-hlr build

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

Change-Id: I6aa997ff2092f9ddf2ac475fd094803be9063980
1 file changed