decoder/ffmpeg: fix build failure with FFmpeg 3.4
av_demuxer_iterate() was added in libavformat 58.9.100. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1178
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av_demuxer_iterate() was added in libavformat 58.9.100. Closes https://github.com/MusicPlayerDaemon/MPD/issues/1178