gtp: Add a global region for the gtp library of OpenGGSN

We want to use libosmocore/libosmovty in the GGSN sourcecode
and reserve a global region here.

TODO-RELEASE

@@ -1,3 +1,4 @@
 #library	what		description / commit summary line
 libosmocore	abi-change	logging: Add ability to save/print current log filters
+libosmocore	abi-change	gtp: Add a global region for the gtp library of OpenGGSN
 libosmovty	abi-change	vty: Check with the application before writing the config

include/osmocom/core/logging.h

@@ -68,7 +68,8 @@ void logp(int subsys, const char *file, int line, int cont, const char *format,
 #define DLMIB		-6
 #define DLSMS		-7
 #define DLCTRL		-8
-#define OSMO_NUM_DLIB	8
+#define DLGTP		-9
+#define OSMO_NUM_DLIB	9
 
 struct log_category {
 	uint8_t loglevel;

src/logging.c

@@ -111,6 +111,11 @@ static const struct log_info_cat internal_cat[OSMO_NUM_DLIB] = {
 		.description = "Control Interface",
 		.enabled = 1, .loglevel = LOGL_NOTICE,
 	},
+	[INT2IDX(DLGTP)] = {
+		.name = "DLGTP",
+		.description = "GPRS GTP library",
+		.enabled = 1, .loglevel = LOGL_NOTICE,
+	},
 };
 
 /*! \brief descriptive string for each log level */