Add flags to prevent strdup() on arguments to av_metadata_set2().
I cannot use the same ABI as ffmbc as value 2 is already used in ffmpeg, besides the name AV_METADATA_NONCONST* makes no sense to me. Add av_metadata_set2() that takes flags. Originally committed as revision 20834 to svn://svn.ffmpeg.org/ffmpeg/trunk
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