rem: parse_str (const unsigned char *s, struct Spec_list *spec_list)
add: parse_str (char const *s, struct Spec_list *spec_list)
context: parse_str (const unsigned char *s, struct Spec_list *spec_list){  struct E_string es;  int fail;  fail = unquote (s, &es);  if (!fail)    fail = build_spec_list (&es, spec_list);  es_free (&es);  return fail;}