Clone of https://github.com/NixOS/nixpkgs.git (to stress-test knotserver)

kdePackages.gwenview: add actual phonon video backend using vlc

In principal the package `phonon-backend-vlc` or `phonon-backend-gstreamer`
could have been used too, but this one is easily found in the same
package set and in the same `kdePackages` scope.

+2
+2
pkgs/kde/gear/gwenview/default.nix
··· 4 qtwayland, 5 qtimageformats, 6 phonon, 7 pkg-config, 8 cfitsio, 9 exiv2, ··· 23 qtimageformats 24 25 phonon 26 27 cfitsio 28 exiv2
··· 4 qtwayland, 5 qtimageformats, 6 phonon, 7 + phonon-vlc, 8 pkg-config, 9 cfitsio, 10 exiv2, ··· 24 qtimageformats 25 26 phonon 27 + phonon-vlc 28 29 cfitsio 30 exiv2