MINOR: listener: export accept_queue_process
This is only to make it resolve in "show tasks".
diff --git a/src/tools.c b/src/tools.c
index f2f456f..8891d47 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -4699,6 +4699,9 @@
{ .func = listener_accept, .name = "listener_accept" },
{ .func = poller_pipe_io_handler, .name = "poller_pipe_io_handler" },
{ .func = mworker_accept_wrapper, .name = "mworker_accept_wrapper" },
+#ifdef USE_THREAD
+ { .func = accept_queue_process, .name = "accept_queue_process" },
+#endif
#ifdef USE_LUA
{ .func = hlua_process_task, .name = "hlua_process_task" },
#endif