Added select() backend which can be used as a fallback if epoll is not available.

src/util/timeout.c

@@ -99,7 +99,7 @@ void timeout_queue_remove(struct timeout_queue* t, struct timeout_evt* evt)
 	size_t pos = (evt->timestamp % t->max);
 	struct timeout_evt* first = t->events[pos];
 
-	if (!first)
+	if (!first || !evt)
 		return;
 
 	if (first == evt)