git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 7a205eb swresample/rematrix: Avoid repeated calls to av_channel_layout* funcs
7a205ebf3a6a1ea14a7fb1d3fa07ccae5fd297dd