CODE: warning supression

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6506 8aca7d54-2c30-db11-9de9-000461428c89
FIX: station status bars dirty marking. take 2.

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6507 8aca7d54-2c30-db11-9de9-000461428c89