Don't pass along unused btStackAlloc everywhere. The API change might user code (derived classes with the old virtual method are not called anymore)

src/BulletMultiThreaded/SpuNarrowPhaseCollisionTask/SpuMinkowskiPenetrationDepthSolver.cpp

@@ -72,10 +72,9 @@ bool SpuMinkowskiPenetrationDepthSolver::calcPenDepth( btSimplexSolverInterface&
 		const btConvexShape* convexA,const btConvexShape* convexB,
 					const btTransform& transA,const btTransform& transB,
 				btVector3& v, btVector3& pa, btVector3& pb,
-				class btIDebugDraw* debugDraw,btStackAlloc* stackAlloc)
+				class btIDebugDraw* debugDraw)
 {
 #if 0
-	(void)stackAlloc;
 	(void)v;