git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 6ef1a95 avformat/matroskaenc: write hvcE BlockAdditionMapping for Dolby Vision EL
6ef1a9579f8d3cf797613f24ddd3d9f43c468659