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vtenc: Disable HW acceleration for interlaced ProRes

Piotr Brzeziński requested to merge thewildtree/gstreamer:applemedia-interlaced-prores-fix into main

As described in #1429 (closed), there's currently a bug where ProRes hardware acceleration (present on all non-base M1 chips) refuses to work at all if we attempt to encode an interlaced video. Other examples of this issue can be found (1, 2) indicating that this is a bug on Apple's side, so for now let's just work around this by disabling HW acceleration entirely for ProRes interlaced.

macOS 13 stable release is coming out next week I think, if it happens to fix this then we can just introduce a version check to re-enable HW acceleration on versions we know won't cause issues.

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