FIX array index

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7261 8aca7d54-2c30-db11-9de9-000461428c89
fix: compile again under GCC (temporary - still need to correct inline assembly syntax)

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7262 8aca7d54-2c30-db11-9de9-000461428c89
ADD: separate repeat images for slope walls

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7263 8aca7d54-2c30-db11-9de9-000461428c89
Only include assembly once

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7264 8aca7d54-2c30-db11-9de9-000461428c89