AAC: Reduce depth of vlc_spectral tables to 2
Up to 6% faster overall on i7, no change on A8. Originally committed as revision 21191 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Up to 6% faster overall on i7, no change on A8. Originally committed as revision 21191 to svn://svn.ffmpeg.org/ffmpeg/trunk