fix(macos): drop max_ref_frames=1 for h264_videotoolbox and enable PARALLEL_ENCODING#5200

ReenigneArcher merged 2 commits into

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RESMP-DEV:fix/macos/h264-videotoolbox-drop-max-ref-framesRESMP-DEV/Sunshine:fix/macos/h264-videotoolbox-drop-max-ref-framesCopy head branch name to clipboard