no need for the signed off messages in our changelog

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>
tools/generate-change-log: workaround for broken Text::Wrap

workaround for broken Text::Wrap:
"This shouldn't happen at /usr/share/perl/5.18/Text/Wrap.pm line 84."
changing huge to overflow make generating changelogs work again at
the price of not having changelog strictly cut of at 80 columns
anymore. Words longer than 80 characters will now printed in one
line. This mainly affects old sf.net urls.

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>
Merge pull request #1280 from sni/fix-generate-change-log

Fix generate change log