src: include new file osmocom/vty/misc.h for vty_out_rate_ctr_group()
This uses the new include file for vty_out_rate_ctr_group() which
available in libosmocore.
diff --git a/openbsc/src/libgb/gprs_ns_vty.c b/openbsc/src/libgb/gprs_ns_vty.c
index 505dc3b..14d7691 100644
--- a/openbsc/src/libgb/gprs_ns_vty.c
+++ b/openbsc/src/libgb/gprs_ns_vty.c
@@ -42,6 +42,7 @@
#include <osmocom/vty/command.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/misc.h>
static struct gprs_ns_inst *vty_nsi = NULL;