[smplayer/el8] (7 commits) ...smplayer.appdata.xml also upstreamed, but not validate well on epel 7 and 8

Summary of changes: 85e8bb0... - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass (*) 4ba8346... sync spec with upstream (*) 5dcb5f3... - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass (*) 838ec27... Add missing build requires (*) 80706ad... Update smplayer to 21.8.0 (*) ba6130c... fix the buld (*) 402e5c4... smplayer.appdata.xml also upstreamed, but not validate well (*) (*) This commit already existed in another branch; no separate mail sent