fix: support older ffmpeg (libavformat < 59) in cv-reader#119
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Add version check for LIBAVFORMAT_VERSION_MAJOR to handle the const AVCodec* change in av_find_best_stream() between ffmpeg 4.x and 5.x. Ubuntu 22.04 ships ffmpeg 4.4 (libavformat 58.x) which uses AVCodec**, while newer ffmpeg 5.0+ (libavformat 59+) uses const AVCodec**.
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The cv-reader build fails on Ubuntu 22.04 which ships with ffmpeg 4.4 (libavformat 58.x).
In ffmpeg 5.0+ (libavformat 59+),
AVCodecbecame const-qualified inav_find_best_stream(). This PR adds a version check to support both old and new ffmpeg APIs.Fixes build error: