Support building open5gs

Change-Id: Id145443ff53f13740167e9dde6417b7e915b8399
diff --git a/all.deps b/all.deps
index 4769d02..7857f16 100644
--- a/all.deps
+++ b/all.deps
@@ -36,6 +36,8 @@
 osmo-e1d	libosmocore
 osmo-remsim	simtrace2_host libosmo-netif
 
+open5gs
+
 # can only clone these
 docker-playground
 osmo-ttcn3-hacks