FFmpeg API Depreciation: FF_PROFILE_*; AV_PROFILE_*

Eden Roserequested to merge
endlesseden/kpipewire:master into master

FFmpeg depreciated FF_PROFILE_* Definition in 2023 (See commit 8238bc0), replacing it with AV_PROFILE_*. Starting in FFMPEG n7.1. See: bug 503505 @ bugs.kde.org

these changes check the libavcodec version and use the new definition on versions post-depreciation. (apologies as this is my first time using gitlab & kde's workflow. If i need to create a issue as well, i will)

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