Move global var bsc_gsmnet into libbsc [2/4]

This is used inside group of files forming libbsc (shared files used by
several apps). Let's instantie only once inside a file from libbsc
instead of doing so on each binary.

This is one further step towards fixing interdependency mess of symbols
and stubs.

Change-Id: I9b287aa492ca6aae5fc56133e1510aff3146fe25

src/ipaccess/ipaccess-config.c

@@ -58,8 +58,6 @@
 #include <osmocom/bsc/bss.h>
 #include <osmocom/bsc/bts.h>
 
-struct gsm_network *bsc_gsmnet;
-
 static int net_listen_testnr;
 static int restart;
 static bool get_attr;

src/osmo-bsc/bsc_init.c

@@ -47,6 +47,8 @@
 #include <limits.h>
 #include <stdbool.h>
 
+struct gsm_network *bsc_gsmnet;
+
 int bsc_shutdown_net(struct gsm_network *net)
 {
 	struct gsm_bts *bts;

src/osmo-bsc/osmo_bsc_main.c

@@ -87,7 +87,6 @@
 
 #include "../../bscconfig.h"
 
-struct gsm_network *bsc_gsmnet = 0;
 static const char *config_file = "osmo-bsc.cfg";
 static const char *rf_ctrl = NULL;
 static int daemonize = 0;

tests/bsc/bsc_test.c

@@ -39,7 +39,6 @@
 #include <search.h>
 
 void *ctx = NULL;
-struct gsm_network *bsc_gsmnet = NULL;
 
 enum test {
 	TEST_SCAN_TO_BTS,

tests/gsm0408/gsm0408_test.c

@@ -57,9 +57,6 @@
 			__FILE__, __LINE__, (int) res, # cmp, (int) wanted);	\
 	}
 
-
-struct gsm_network *bsc_gsmnet = NULL;
-
 static inline void gen(struct gsm_bts *bts, const char *s)
 {
 	int r;

tests/handover/handover_test.c

@@ -58,8 +58,6 @@
 
 void *ctx;
 
-struct gsm_network *bsc_gsmnet;
-
 /* override, requires '-Wl,--wrap=osmo_mgcpc_ep_ci_request'.
  * Catch modification of an MGCP connection. */
 void __real_osmo_mgcpc_ep_ci_request(struct osmo_mgcpc_ep_ci *ci,