Update: Avoid logging in signal handler

See also: #2472

src/connection.c

@@ -903,6 +903,7 @@ void connection_accept_loop(void)
             connection_queue(con);
         }
     }
+    ICECAST_LOG_INFO("No longer running. Shutting down...");
 
     /* Give all the other threads notification to shut down */
 

src/sighandler.c

@@ -62,8 +62,6 @@ void _sig_hup(int signo)
 
 void _sig_die(int signo)
 {
-    ICECAST_LOG_INFO("Caught signal %d, shutting down...", signo);
-
     /* inform the server to start shutting down */
     global.running = ICECAST_HALTING;
 }