[mixxx/f40] (8 commits) ...New upstream release 2.5.0 - fix dependencies

Summary of changes: e5cf2b1... use tar.gz source instead of zip for libkeyfinder (*) 20881c1... Revert "use tar.gz source instead of zip for libkeyfinder" (*) 923cf18... Test removing some packages (*) f25641b... Fully remove ffmpeg from build (*) 850d1f0... New upstream release 2.5.0 (*) dc5e2de... New upstream release 2.5.0, fix dependencies (*) bf7a592... New upstream release 2.5.0 - fixed dependencies (*) 57bfba6... New upstream release 2.5.0 - fix dependencies (*) (*) This commit already existed in another branch; no separate mail sent