git version 2.4.0
Removing ffbuild/config.log
From https://git.ffmpeg.org/ffmpeg
 * branch            master     -> FETCH_HEAD
HEAD is now at 2b6fbca swscale/vulkan: compile SPIR-V backed only if SPIR-V headers are found
2b6fbcad6d53282136cf3310a9421cc16b012fcf