[mixxx/f28] (5 commits) ...Update to 2.1.0-rc1 pre-release version

Summary of changes: 61c3c47... Update to 2.1 snapshot (*) 0c28438... Disable FFmpeg (*) fa5d31b... Re-add missing dist macro (*) 38a8b52... Update to (inofficial) 2.1.0-rc1 snapshot (*) 9b3db1d... Update to 2.1.0-rc1 pre-release version (*) (*) This commit already existed in another branch; no separate mail sent