BUILD: listener: fix build warning on global_listener_rwlock without threads
The global_listener_rwlock was introduced by recent commit 13e86d947
("BUG/MEDIUM: listener: Fix race condition when updating the global mngmt
task"), but it's declared static and is not used when threads are disabled,
thus causing a warning to be emitted in this case. Let's just condition it
to thread usage to shut the warning.
This will need to be backported where the patch above is backported.
diff --git a/src/listener.c b/src/listener.c
index 6cd365a..c94702a 100644
--- a/src/listener.c
+++ b/src/listener.c
@@ -47,7 +47,7 @@
/* list of the temporarily limited listeners because of lack of resource */
static struct mt_list global_listener_queue = MT_LIST_HEAD_INIT(global_listener_queue);
static struct task *global_listener_queue_task;
-static HA_RWLOCK_T global_listener_rwlock;
+__decl_thread(static HA_RWLOCK_T global_listener_rwlock);
/* listener status for stats */
const char* li_status_st[LI_STATE_COUNT] = {