Make is easier to compile Bullet/Extras/sph:

1) use $(CUDA_INC_PATH) for CUDA include path
2) avoid using cuda util, but use BT_GPU_SAFE_CALL and BT_GPU_CHECK_ERROR (defined in Bullet/Extras/CUDA/btCudaUtil.h)
3) remove pre-linked glee*.lib, but include glee.c directly

Extras/sph/fluids/fluid_system.cpp

@@ -134,7 +134,7 @@ int FluidSystem::AddPointReuse ()
 
 void FluidSystem::Run ()
 {
-	bool bTiming = true;
+	bool bTiming = false;//true;
 
 	mint::Time start, stop;