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

*** 358,367 ****
  
          if (rp) {
                  /* 
                   * if found,  print starting with the space after the ':'
                   */
!                 colon = (wchar_t *) wschr(rp->oldline, (int) colon_char);
                  (void) printf("%s", colon + 1);
          }
  }
                  
--- 358,367 ----
  
          if (rp) {
                  /* 
                   * if found,  print starting with the space after the ':'
                   */
!                 colon = (wchar_t *) wcschr(rp->oldline, (int) colon_char);
                  (void) printf("%s", colon + 1);
          }
  }