git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 47c6af7 avutil/avassert: always implement av_assume with av_unreachable
47c6af7d299c96b2e65f5f10526e0f34e00b23c8