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/BulletCollision/NarrowPhaseCollision/btMinkowskiPenetrationDepthSolver.cpp

@@ -26,11 +26,10 @@ bool btMinkowskiPenetrationDepthSolver::calcPenDepth(btSimplexSolverInterface& s
 												   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
 												   )
 {
 
-	(void)stackAlloc;
 	(void)v;
 	
 	bool check2d= convexA->isConvex2d() && convexB->isConvex2d();