Log Message:
update to jhead-1.8.
changes:

- Ignore undefined bits of "flash used" tag, as cannon sets them nonzero,
  causing jhead to indicate flash used when it wasn't with some Canon models.
- Automatic rotation using jpegtran & clear rotation element
- Option to put a file in as comments (as opposed to edit file)

This adresses pkg/17816 by Eric Jacoboni