git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 6850110 avcodec/x86/pngdsp: Remove MMXEXT function overridden by SSSE3
685011003fd9656a08492a40b375bf1c2b8f0ebb