make sure aligned structures/classes use the btAlignedAlloc/btAlignedFree, by overriding the operator new/delete for that struct/class.

integrated some contributions from IBM Germany for libspe2

src/BulletCollision/CollisionShapes/btConvexShape.h

@@ -22,6 +22,7 @@ subject to the following restrictions:
 #include "LinearMath/btTransform.h"
 #include "LinearMath/btMatrix3x3.h"
 #include "btCollisionMargin.h"
+#include "LinearMath/btAlignedAllocator.h"
 
 //todo: get rid of this btConvexCastResult thing!
 struct btConvexCastResult;
@@ -36,6 +37,8 @@ ATTRIBUTE_ALIGNED16(class) btConvexShape : public btCollisionShape
 
 public:
 
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+
 	virtual ~btConvexShape()
 	{