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

*** 495,505 ****
                          str.init(p);
                          wchar_t * wcb = str.get_string();
                          if ((p->colons != no_colon) &&
                              ((wcb[0] != (int) period_char) ||
                               ((wcb[0] == (int) period_char) &&
!                               (wschr(wcb, (int) slash_char))))) {
                                  print_target_n_deps(p);
                          }
          }
  }
  
--- 495,505 ----
                          str.init(p);
                          wchar_t * wcb = str.get_string();
                          if ((p->colons != no_colon) &&
                              ((wcb[0] != (int) period_char) ||
                               ((wcb[0] == (int) period_char) &&
!                               (wcschr(wcb, (int) slash_char))))) {
                                  print_target_n_deps(p);
                          }
          }
  }