[dx9-13] Add IndexBuffer support

[Ann and Jason Edmeades]

Again, this adds the Index Buffer support into wined3d and calls it from
d3d9. FWIW I cant modify d3d8 to call it yet although I do have a local copy
where these changes have been made.

Changelog

Add the indexbuffer support into wined3d

Jason
Note this adds a new file, indexbuffer.c
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