git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at a4317c4 avcodec/webvttdec: map WebVTT cue timestamps to ASS {\kf} tags
a4317c4ff8b0fcd0b486f6a57628bbcf6f0aa5eb