FIX: convoi loading max waiting time

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7180 8aca7d54-2c30-db11-9de9-000461428c89
revert r7131 so MinGW can compile with BUILDDIR= set

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7181 8aca7d54-2c30-db11-9de9-000461428c89
FIX: loading screen bar overflow

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7182 8aca7d54-2c30-db11-9de9-000461428c89