-union control *ctrl_filesel(struct controlset *s,char *label,char shortcut,
- char const *filter, int write, char *title,
- intorptr helpctx, handler_fn handler,
- intorptr context)
+union control *ctrl_filesel(struct controlset *s, const char *label,
+ char shortcut, const char *filter, int write,
+ const char *title, intorptr helpctx,
+ handler_fn handler, intorptr context)