Suppressed warnings about non existing boot equipment files when mkisofs emulation is active

xorriso/parse_exec.c

@@ -983,12 +983,14 @@ next_command:;
      if((*idx)>=argc)
        {ret= 1; goto ex;}
    }
+   xorriso->current_interpreter= 0;
    if((xorriso->arrange_args || (flag & 8)) && !(flag & (4 | 16))) {
      ret= Xorriso_exec_args_sorted(xorriso, argc, argv, idx, 0);
      goto ex;
    } 
  }
 
+ xorriso->current_interpreter= 0;
  ret= Xorriso_count_args(xorriso, argc - *idx, argv + *idx, &arg_count, 1);
  if((ret == 1 || ret == 2) &&
     strcmp(argv[*idx], xorriso->list_delimiter) != 0) {