[ffmpeg] Enable D3D12VA on Windows

[julianxhokaxhiu]

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FFMpeg seems to support it just fine for a while, but was never enabled for this port.
See https://www.gyan.dev/ffmpeg/builds/#about-these-builds

[MonicaLiu0311]

Please get failure logs here:

BUILD_ARCH=x86_64
OPTION_VARIABLE=OPTIONS_x86_64
=== CONFIGURING ===
Unknown option "--enable-d3d12va".
See /d/b/ffmpeg/src/n6.1.1-92c5eda8dc.clean/configure --help for available options.

[kadirlua]

Please get failure logs here:

BUILD_ARCH=x86_64
OPTION_VARIABLE=OPTIONS_x86_64
=== CONFIGURING ===
Unknown option "--enable-d3d12va".
See /d/b/ffmpeg/src/n6.1.1-92c5eda8dc.clean/configure --help for available options.

As I know, this config option has been added in ffmpeg 7.0.

[julianxhokaxhiu]

As I know, this config option has been added in ffmpeg 7.0.

You're right, sorry not sure how I missed that. I'll add a comment on #38011 to ask if possible to be added there. Closing this PR as it will never work on 6.1.1. Sorry and thanks again

[kadirlua]

As I know, this config option has been added in ffmpeg 7.0.

You're right, sorry not sure how I missed that. I'll add a comment on #38011 to ask if possible to be added there. Closing this PR as it will never work on 6.1.1. Sorry and thanks again

No problem, after #38011 completed you can create new one or open this again.