include: Add proper predeclaration for struct in system_information.h
We use them, so declare them. (avoid including all gsm_data.h)
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/openbsc/include/openbsc/system_information.h b/openbsc/include/openbsc/system_information.h
index f2cdbfb..da662e9 100644
--- a/openbsc/include/openbsc/system_information.h
+++ b/openbsc/include/openbsc/system_information.h
@@ -5,6 +5,9 @@
#define GSM_MACBLOCK_LEN 23
+struct gsm_bts;
+
+
enum osmo_sysinfo_type {
SYSINFO_TYPE_NONE,
SYSINFO_TYPE_1,