git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 9e4041d avcodec/opus: use precomputed NLSF weights for Silk decoder
9e4041d5ea657a36c9039a0815b5869e30bf4fb5