fix py bindings for boost versions older than 1.44
fix py bindings for boost versions older than 1.44

sonny-tarbouriech/ompl,jvgomez/ompl,utiasASRL/batch-informed-trees,florianhauer/ompl,davetcoleman/ompl,utiasASRL/batch-informed-trees,florianhauer/ompl,davetcoleman/ompl,sonny-tarbouriech/ompl,florianhauer/ompl,davetcoleman/ompl,sonny-tarbouriech/ompl,jvgomez/ompl,sonny-tarbouriech/ompl,jvgomez/ompl,davetcoleman/ompl,sonny-tarbouriech/ompl,utiasASRL/batch-informed-trees,florianhauer/ompl,utiasASRL/batch-informed-trees,davetcoleman/ompl,florianhauer/ompl,jvgomez/ompl,jvgomez/ompl,utiasASRL/batch-informed-trees,jvgomez/ompl,utiasASRL/batch-informed-trees,florianhauer/ompl,davetcoleman/ompl,sonny-tarbouriech/ompl