fix most of build warnings on openbsd

sorry openbsd people, we're not going to use the snprintf function.

src/win.c

@@ -470,7 +470,8 @@ void win_process_update_flags(session_t *ps, struct managed_win *w) {
 	// Whether the window was visible before we process the mapped flag. i.e.
 	// is the window just mapped.
 	bool was_visible = win_is_real_visible(w);
-	log_trace("Processing flags for window %#010x (%s), was visible: %d, flags: %#lx",
+	log_trace("Processing flags for window %#010x (%s), was visible: %d, flags: "
+	          "%#" PRIx64,
 	          w->base.id, w->name, was_visible, w->flags);
 
 	if (win_check_flags_all(w, WIN_FLAGS_MAPPED)) {