debian: Uninstall PDF files (DFSG-nonfree)

Philippe Covalrequested to merge
rzr/python-tuf:sandbox/rzr/debian/review/master into debian/master

Because they can't be regenerated from (missing) sources

Relate-to: https://github.com/theupdateframework/tuf/issues/263#issuecomment-835239415 Cc: <@tumbleweed> Signed-off-by: Philippe Coval rzr@users.sf.net

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