d3dx9: Implement D3DXPlaneTransformArray.

[Vitaliy Margolen]

Philip Nilsson wrote:
> Thanks to joaopa for pointing out that I forgot this function.
> 

> +D3DXPLANE* WINAPI D3DXPlaneTransformArray(
> +    D3DXPLANE* out, UINT outstride, CONST D3DXPLANE* in, UINT instride,
> +    CONST D3DXMATRIX* matrix, UINT elements)
> +{
> +    unsigned int i;
> +    TRACE("\n");
> +    for (i = 0; i < elements; ++i) {

Please don't mix and match win types and C types. If it says "UINT" in the 
function declaration then make the iterator "UINT i" as well.

Vitaliy.