reduced TaskSchedulerTBB stack to 4MB again, main thread anyway has no larger stack
reduced TaskSchedulerTBB stack to 4MB again, main thread anyway has no larger stack

Sjoerdie/embree,embree/embree,embree/embree,embree/embree,Sjoerdie/embree,embree/embree,Sjoerdie/embree,Sjoerdie/embree