decoder/ffmpeg: support FFmpeg 2.5
Version 2.5 fixed an API oddity, however it broke API compatibility, at least with C++. Disable the workaround when a libavformat version is detected that is recent enough.
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Version 2.5 fixed an API oddity, however it broke API compatibility, at least with C++. Disable the workaround when a libavformat version is detected that is recent enough.