Make struct formats for specifying file size to be unsigned instead of signed (ZIP file spec. says in section K, "General notes" in point 1 that unless specified otherwise values are unsigned and they are not specified as signed in the spec).
Make struct formats for specifying file size to be unsigned instead of signed
(ZIP file spec. says in section K, "General notes" in point 1 that unless
specified otherwise values are unsigned and they are not specified as signed in
the spec).

Closes bug #679953.  Thanks Jimmy Burgett.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator