split off osmo-sgsn: remove files, apply build

Change-Id: I5d27ff93e56cd13e0e70edd15e2080201e35e91f
diff --git a/src/gprs/gb_proxy_vty.c b/src/gprs/gb_proxy_vty.c
index 86d65a8..bd5bb1b 100644
--- a/src/gprs/gb_proxy_vty.c
+++ b/src/gprs/gb_proxy_vty.c
@@ -26,8 +26,8 @@
 
 #include <osmocom/core/talloc.h>
 #include <osmocom/core/rate_ctr.h>
+#include <osmocom/gsm/gsm48.h>
 
-#include <openbsc/gsm_04_08.h>
 #include <osmocom/gprs/gprs_ns.h>
 #include <osmocom/gsm/apn.h>