Make BenchmarkDemo a console application, without OpenGL/Glut dependency.

Fix potential division by zero when enabling convex distance utility.
Thanks to linzner http://code.google.com/p/bullet/issues/detail?id=264

Demos/OpenGL/GlutDemoApplication.cpp

@@ -1,5 +1,5 @@
 
-#ifndef _WINDOWS
+
 #include "GlutDemoApplication.h"
 
 #include "GlutStuff.h"
@@ -81,5 +81,5 @@ void GlutDemoApplication::swapBuffers()
 
 }
 
-#endif //_WINDOWS
+