Set the input_charset for image reading.

ng_src/isofs_wrap.c

@@ -159,6 +159,7 @@ int isoburn_read_image(struct burn_drive *d,
  ropts.mode = read_opts->mode;
  ropts.uid = read_opts->uid;
  ropts.gid = read_opts->gid;
+ ropts.input_charset = read_opts->input_charset;
 
  /* create the data source */
  ds = isoburn_data_source_new(d);