move gsm_04_08_gprs.h to libosmocore
This requres the corresponding commit in libosmocore.
diff --git a/openbsc/src/gprs/sgsn_libgtp.c b/openbsc/src/gprs/sgsn_libgtp.c
index aff2f91..aaf7e7a 100644
--- a/openbsc/src/gprs/sgsn_libgtp.c
+++ b/openbsc/src/gprs/sgsn_libgtp.c
@@ -38,8 +38,8 @@
#include <osmocom/core/select.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/gprs/gprs_bssgp.h>
+#include <osmocom/gsm/protocol/gsm_04_08_gprs.h>
-#include <openbsc/gsm_04_08_gprs.h>
#include <openbsc/signal.h>
#include <openbsc/debug.h>
#include <openbsc/sgsn.h>