no shell substitutions in findrevision.sh any more

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7435 8aca7d54-2c30-db11-9de9-000461428c89
FIX: shell distribute command requires since for string comparsin plus some quotes were missing

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7436 8aca7d54-2c30-db11-9de9-000461428c89