d3dx8 :Fix D3DXCreateMatrixStack

[tony.wasserka at freenet.de]

> The commit comment for this patch is rather non-descriptive... what is
> this supposed to fix?
> An array based stack seems more appropriate than a list based one for
> ID3DXMATRIXStack, why change that?

I think so, too (after taking a closer look at the interface documentation at msdn).
Though it ain't really a good argument, but msdn gives a code example
where they show that they use arrays internally:

http://msdn2.microsoft.com/en-us/library/bb174057(VS.85).aspx
m_pstack[m_currentPos] = m_pstack[m_currentPos] * (*pMat);





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