Remove unnecessary chipmunk engine tick function from arena.c
Remove unnecessary chipmunk engine tick function from arena.c

omf2097/openomf,omf2097/openomf,gdeda/openomf,gdeda/openomf,omf2097/openomf,pmjdebruijn/openomf,pmjdebruijn/openomf,pmjdebruijn/openomf,gdeda/openomf