[mpv/el8] (6 commits) ...Merge branch 'master' into el8

Summary of changes: d87a226... Upstream reduced the required libavutil version (*) 6e46cff... f30 and below doesn't have ppc64le luajit (*) 2d06fd4... rebuild for libdvdread ABI bump (*) 68fd3b8... Rebuild for new libplacebo version (*) 413f543... Update to 0.31.0 (*) 5bb3915... Merge branch 'master' into el8 (*) This commit already existed in another branch; no separate mail sent