SOme fixes to autoconf

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7314 8aca7d54-2c30-db11-9de9-000461428c89
FIX: (Drsupergood) Industry crossconnection on load

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7315 8aca7d54-2c30-db11-9de9-000461428c89
Some more fixes to autoconf

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7316 8aca7d54-2c30-db11-9de9-000461428c89