[PATCH V4 1/2] d3dx9_36: Add semi-stub for D3DXOptimizeVertices.

[Vijay Kiran Kamuju]

Added more checks and tests.
Also fixed warnings.
> From : Christian Costa <titan.costa(a)gmail.com>
> Signed-off-by: Vijay Kiran Kamuju <infyquest(a)gmail.com>