11235 make -C fails under GCC7

*** 2543,2552 ****
--- 2543,2554 ----
                                  }
                                  if (chdir(argv[i + 1]) != 0) {
                                          fatal(gettext("failed to change to directory %s: %s"),
                                              argv[i + 1], strerror(errno));
                                  }
+                                 MBSTOWCS(wcs_buffer, "DMAKE_CDIR");
+                                 name = GETNAME(wcs_buffer, FIND_LENGTH);
                                  path_reset = true;
                                  rebuild_arg0 = true;
                                  (void) get_current_path();
                                  break;
                          default: /* Shouldn't reach here */