[smplayer/el8] (6 commits) ...Update smplayer to 21.1.0

Summary of changes: e84b5bf... Update helper script (*) 937e56a... Add BR qt5-qtbase-private-devel (*) 852340e... - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass (*) fe746f5... Fix and vailidate appdata (*) a1c668d... Update skins and themes (*) 5efdffe... Update smplayer to 21.1.0 (*) (*) This commit already existed in another branch; no separate mail sent