git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 5fac8ad avutil/log: use atomics to load and store logging level, flags and callback pointer
5fac8addc5e84a3ad418e4a16d3a090db8c2566e