avformat/vorbiscomment: Replace AVDictionary ** by const AVDictionary *
ff_vorbiscomment_write() used an AVDictionary ** parameter for a dictionary whose contents ought to be written; yet this can be replaced by AVDictionary * since commit 042ca05f; and this in turn can be replaced by const AVDictionary * to indicate that the dictionary isn't modified; the latter also applies to ff_vorbiscomment_length(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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