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

*** 168,178 ****
          /*
           * First figure out how long the string is.
           * If the len argument is -1 we count the chars here.
           */
          if (len == FIND_LENGTH) {
!                 length = wslen(name);
          } else {
                  length = len;
          }
  
          Wstring ws;
--- 168,178 ----
          /*
           * First figure out how long the string is.
           * If the len argument is -1 we count the chars here.
           */
          if (len == FIND_LENGTH) {
!                 length = wcslen(name);
          } else {
                  length = len;
          }
  
          Wstring ws;
*** 679,700 ****
   */
  void
  append_string(register wchar_t *from, register String to, register int length)
  {
          if (length == FIND_LENGTH) {
!                 length = wslen(from);
          }
          if (to->buffer.start == NULL) {
                  expand_string(to, 32 + length);
          }
          if (to->buffer.end - to->text.p <= length) {
                  expand_string(to,
                                (to->buffer.end - to->buffer.start) * 2 +
                                length);
          }
          if (length > 0) {
!                 (void) wsncpy(to->text.p, from, length);
                  to->text.p += length;
          }
          *(to->text.p) = (int) nul_char;
  }
  
--- 679,700 ----
   */
  void
  append_string(register wchar_t *from, register String to, register int length)
  {
          if (length == FIND_LENGTH) {
!                 length = wcslen(from);
          }
          if (to->buffer.start == NULL) {
                  expand_string(to, 32 + length);
          }
          if (to->buffer.end - to->text.p <= length) {
                  expand_string(to,
                                (to->buffer.end - to->buffer.start) * 2 +
                                length);
          }
          if (length > 0) {
!                 (void) wcsncpy(to->text.p, from, length);
                  to->text.p += length;
          }
          *(to->text.p) = (int) nul_char;
  }
  
*** 765,775 ****
           * Get more memory, copy the string and free the old buffer if
           * it is was malloc()'ed.
           */
          expandstring_count++;
          p = ALLOC_WC(length);
!         (void) wscpy(p, string->buffer.start);
          string->text.p = p + (string->text.p - string->buffer.start);
          string->text.end = p + (string->text.end - string->buffer.start);
          string->buffer.end = p + length;
          if (string->free_after_use) {
                  retmem(string->buffer.start);
--- 765,775 ----
           * Get more memory, copy the string and free the old buffer if
           * it is was malloc()'ed.
           */
          expandstring_count++;
          p = ALLOC_WC(length);
!         (void) wcscpy(p, string->buffer.start);
          string->text.p = p + (string->text.p - string->buffer.start);
          string->text.end = p + (string->text.end - string->buffer.start);
          string->buffer.end = p + length;
          if (string->free_after_use) {
                  retmem(string->buffer.start);