Re: [PATCH] include: add AV1 support to dxva.h

[Biswapriyo Nath]

The structures are not present in the current stable Windows 10 SDK 19041
build aka. 20H1. I have found those in the latest Windows 10 Insider SDK
20206 build aka. 20H2. Also the docx provided by Steve Lhomme has this in
the copyright notice:

"Information and views expressed in this document, including URL and other
Internet Web site references, may change without notice. You bear the risk
of using it."

But the DXVA_ModeAV1_VLD GUIDs are present in 20H1 WinSDK which may be
added safely.