use scale factor instead of sum for downmix level adjustment. avoids division
inside downmix loop. 7% faster 5.1-to-stereo downmixing. Originally committed as revision 12287 to svn://svn.ffmpeg.org/ffmpeg/trunk
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inside downmix loop. 7% faster 5.1-to-stereo downmixing. Originally committed as revision 12287 to svn://svn.ffmpeg.org/ffmpeg/trunk