directx_va: define missing DXVA_xxx GUIDs for the platform SDK and mingw
Favor the DXVA_xxx variants which are the most common ones. Redirect missing DXVA_xxx variants to existing alternatives in mingw-w64.
Some GUIDs do not exist in any SDK so we need to define them ourselves. Then we share the redirections with dxva_blocklist.
Edited by Steve Lhomme