towlower_l
wint_t towlower_l(wint_t, locale_t);
PROTO_NORMAL(towlower_l);
DEF_WEAK(towlower_l);
while ((l1 = towlower_l(*s1++, locale)) ==
(l2 = towlower_l(*s2++, locale))) {
if (((l1 = towlower_l(*s1++, locale))) !=
(l2 = towlower_l(*s2++, locale))) {