fix cubescape example for mac
fix cubescape example for mac

cginternals/glbinding,mcleary/glbinding,mcleary/glbinding,hpicgs/glbinding,hpicgs/glbinding,hpi-r2d2/glbinding,hpi-r2d2/glbinding,cginternals/glbinding,hpi-r2d2/glbinding,hpicgs/glbinding,j-o/glbinding,j-o/glbinding,hpi-r2d2/glbinding,j-o/glbinding,j-o/glbinding,mcleary/glbinding,hpicgs/glbinding,mcleary/glbinding