Ignore format 3.0 packages in diffclean plugin
Ignore format 3.0 packages in diffclean plugin

A check on .diff.gz only makes sense when a .diff.gz is available.
Running diffstat on .debian.tar.gz files gave incorrect results.

Signed-off-by: Arno Töll <a6eb4d9d7f99ca47abe56f3220597663cf37ca4a@toell.net>

swvist/Debexpo,swvist/Debexpo,jadonk/debexpo,swvist/Debexpo,jadonk/debexpo,jonnylamb/debexpo,jadonk/debexpo,jonnylamb/debexpo,jonnylamb/debexpo