Fix flickering roundabout ( http://forum.simutrans.com/index.php?topic=11015.msg109721;topicseen#new )
Fix flickering roundabout
( http://forum.simutrans.com/index.php?topic=11015.msg109721;topicseen#new )

git-svn-id: ad2a872dfb5accdcee22c80d0a136769e8f61d01@1136 e96eaf88-093e-0410-925f-862d53288611

simutrans/pak128,simutrans/pak128,simutrans/pak128,simutrans/pak128,simutrans/pak128