[xine-lib/el8] (34 commits) ...Disable currently missing features on EL8

Summary of changes: 2e2c1f2... Rebuild for ffmpeg-3.* on el7 (*) f13f521... Enable building from snapshot (*) 54f7ceb... Enable SSH and NFS input plugins (*) 814e196... Enable TLS support (*) 4880d03... Enable AV1 support through libaom (*) 7890a37... Update snapshot (*) fdbce55... Add support for rpi (*) 7d804b2... Fix BR: for raspberry-vc (*) ab0537f... - Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass (*) 53dc45d... Update snapshot (*) fa8cffc... Add script to make a snapshot (*) 1e8c3f3... Enable EGL support (*) fd0714d... Enable mpeg2 encoding support for dxr3 (*) 023798a... Don't glob soname (*) d3175d6... Clean up and sort BuildRequires (*) fa50d58... Enable fontconfig support (*) 637984b... No NFS support on EL6 (*) b4edd67... Add patch to revert gettext version bump on EL6 (*) 9f817f0... No wayland nor openssl support on EL6 (*) 42d1a5a... New snapshot (*) 1674a24... Remove now unneeded 32 bits build fix (*) c1fb769... Cosmetic spec cleanup (*) 83f1ffd... Remove unneeded SDL build flags setting (*) 294be32... Rebuild for new ffmpeg version (*) 1c7f3de... Rebuild for aom SONAME bump (*) 6bbe35f... Remove xvmc files (*) 51c72b8... Fix typo from 1c7f3de (*) 0f881d0... New snapshot (*) 5c613af... Enable libpng based video decoder (*) a840425... Add version to BR: where relevant (*) d3601fd... Conditionally add XvMC support back (*) 10afe2f... Enable libdav1d based video decoder (F31+) (*) 51fad32... Rework features enablement (*) 6a24a42... Disable currently missing features on EL8 (*) (*) This commit already existed in another branch; no separate mail sent