include: Improve include directives in d3dx9* headers.

[Matteo Bruni]

2016-07-22 15:37 GMT+02:00 Andrey Gusev <andrey.goosev at gmail.com>:

With the subject changed to something along the lines of "include:
Make include directives in d3dx9* headers consistent with the original
version." this gets my

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>

That said, if Henri or anyone else doesn't agree I'm okay with
dropping this patch. I don't think it's a big deal either way.