copy glut*.dll next to executable using cmake postbuild step

re-add CollisionInterfaceDemo to cmake

Demos/Benchmarks/BenchmarkDemo.cpp

@@ -13,6 +13,7 @@ subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 */
 
+
 // Collision Radius
 #define COLLISION_RADIUS 0.0f