make: use the more modern wchar routines, not widec.h

*** 1144,1155 ****
          line->body.line.less = less;
  
          if (lmn_target->parenleft) {
                  Wstring lmn_string(lmn_target);
  
!                 wchar_t *left = (wchar_t *) wschr(lmn_string.get_string(), (int) parenleft_char);
!                 wchar_t *right = (wchar_t *) wschr(lmn_string.get_string(), (int) parenright_char);
  
                  if ((left == NULL) || (right == NULL)) {
                          line->body.line.percent = NULL;
                  } else {
                          line->body.line.percent = GETNAME(left + 1, right - left - 1);
--- 1144,1155 ----
          line->body.line.less = less;
  
          if (lmn_target->parenleft) {
                  Wstring lmn_string(lmn_target);
  
!                 wchar_t *left = (wchar_t *) wcschr(lmn_string.get_string(), (int) parenleft_char);
!                 wchar_t *right = (wchar_t *) wcschr(lmn_string.get_string(), (int) parenright_char);
  
                  if ((left == NULL) || (right == NULL)) {
                          line->body.line.percent = NULL;
                  } else {
                          line->body.line.percent = GETNAME(left + 1, right - left - 1);