git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at b2910ec9 avcodec/mfenc: fix memory leak with D3D11 input surfaces
b2910ec92ef0f12f2cee56be331f8ae234ead4a4