Function add_symlink_to_tar_from_walk 

fn add_symlink_to_tar_from_walk<W: Write>(
    tar_builder: &mut Builder<W>,
    dir: &Dir,
    filename: &OsStr,
    absolute_path: &Path,
    relative_path: &Path,
    sepolicy_state: &SepolicyState,
    unlabeled_count: &mut u64,
) -> Result<()>