Bug#1106308: widelands: FTBFS: Error: Licence file changed.

[Santiago Vila]

retitle 1106308 widelands: FTBFS: Error: Licence file changed.
thanks

Hello. When fixing this, please stop relying on the the exact
copy of the GPL-2 which base-files provides, as it can change
from time to time for minor editorial changes (as it was the
case here).

Or maybe use whatever is in /usr/share/common-licenses
unconditionally and without giving an error.

An idea would be to check that the files match but only when
creating a new source package. Unfortunately, I don't know
if such thing is possible.

Another idea that would probably work is to show a warning
message (but not an error) for 10 minutes if the files
do not match. That would still make the package buildable
indefinitely, but would be annoying enough for anybody
creating a new source package.

Yet another idea would be to use debian/source/local-options
(in the git repo, but not in the source package), but I have
never tested that.

Thanks.