remove OpenGL/glu.h from gl3 headers (warning), replace some OpenGL definitions ARB/non-ARB

Demos3/GpuDemos/softbody/GpuSoftBodyDemo.cpp

@@ -1,4 +1,6 @@
+
 #include "GpuSoftBodyDemo.h"
+#define USE_BARREL_VERTICES
 #include "OpenGLWindow/ShapeData.h"
 #include "OpenGLWindow/GLInstancingRenderer.h"
 #include "Bullet3Common/b3Quaternion.h"
@@ -414,4 +416,4 @@ void	GpuSoftClothDemo::setupScene(const ConstructionInfo& ci)
 	err = glGetError();
 	assert(err==GL_NO_ERROR);
 
-}	
+}