Process events posted by ngx_close_idle_connections() immediately.

Previously, if an event was posted by a read event handler, called by
ngx_close_idle_connections(), that event was not processed until the next
event loop iteration, which could happen after a timeout.

src/os/unix/ngx_process_cycle.c

@@ -736,6 +736,7 @@ ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
                 ngx_set_shutdown_timer(cycle);
                 ngx_close_listening_sockets(cycle);
                 ngx_close_idle_connections(cycle);
+                ngx_event_process_posted(cycle, &ngx_posted_events);
             }
         }
 

src/os/win32/ngx_process_cycle.c

@@ -804,6 +804,7 @@ ngx_worker_thread(void *data)
                 ngx_set_shutdown_timer(cycle);
                 ngx_close_listening_sockets(cycle);
                 ngx_close_idle_connections(cycle);
+                ngx_event_process_posted(cycle, &ngx_posted_events);
             }
         }