We didn't recognise files like
as orig files. As a result, dgit would see all the things in the
corresponding subdirectory as having been added in Debian changes,
leading it making inaccurate complaints and bombing out.
See also #918438 against policy, where I (effectively) argue that this
is a design error in the `3.0 (quilt)' format.
Signed-off-by: Ian Jackson <email@example.com>