Suppress -Wdangling-pointer in event_signal_closure()

gcc 12 complains:

    [34/46] Building C object CMakeFiles/event_static.dir/event.c.o
    /src/le/libevent/event.c: In function ‘event_signal_closure’:
    /src/le/libevent/event.c:1384:32: warning: storing the address of local variable ‘ncalls’ in ‘*ev.ev_.ev_signal.ev_pncalls’ [-Wdangling-pointer=]
     1384 |                 ev->ev_pncalls = &ncalls;
          |                 ~~~~~~~~~~~~~~~^~~~~~~~~
    /src/le/libevent/event.c:1378:15: note: ‘ncalls’ declared here
     1378 |         short ncalls;
          |               ^~~~~~
    /src/le/libevent/event.c:1378:15: note: ‘ev’ declared here

event.c

@@ -1375,6 +1375,15 @@ event_haveevents(struct event_base *base)
 static inline void
 event_signal_closure(struct event_base *base, struct event *ev)
 {
+#if defined(__clang__)
+#elif defined(__GNUC__)
+#pragma GCC diagnostic push
+/* NOTE: it is better to avoid such code all together, by using separate
+ * variable to break the loop in the event structure, but now this code is safe
+ * */
+#pragma GCC diagnostic ignored "-Wdangling-pointer"
+#endif
+
 	short ncalls;
 	int should_break;
 
@@ -1400,6 +1409,11 @@ event_signal_closure(struct event_base *base, struct event *ev)
 			return;
 		}
 	}
+
+#if defined(__clang__)
+#elif defined(__GNUC__)
+#pragma GCC diagnostic pop
+#endif
 }
 
 /* Common timeouts are special timeouts that are handled as queues rather than