git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 7a1c737 libavcodec/v4l2_buffers: avoid redefinition of USEC_PER_SEC macro
7a1c737c359509f59c8552e79b2fa6a191d61ad9