clementine: disable unfree dependencies by default

Clementine has an optional dependency on libspotify, which is unfree.
Enabling libspotify unconditionally prevented Hydra from distributing
Clementine. Now, we optionally enable it based on
config.clementine.spotify.
Nafees font family (5 fonts)
Add expression to build the eboard chess client
Correct patch the rpath for GHC-built executables on Darwin

@peti This addresses #2488.
basex: update 7.7.2 -> 7.8.2
bcache-tools: update 1.0.5 -> 1.0.7
srecord: update 1.62 -> 1.63
munin: update 2.0.20 -> 2.0.21 (bug fix)
nixos: add 'gvfs' when using GNOME3 desktop

One reason for adding this is to make Chromium able to open files it has
downloaded.

Currently this happens:
  /run/current-system/sw/bin/xdg-open: line 364: gnome-open: command not found

(And nothing happens in the GUI when clicking a downloaded file.)

Looking into xdg-open, one can see that it first tries to run gvfs-open
and then falls back to gnome-open. Adding 'gvfs' makes the first command
succeed.
xca: fix package

For some reason library paths are not set at all for some libraries during
the build. Wrapper with LD_LIBRARY_PATH set for relevant libraries is currently
solution.
weechatDev: 0.4.4dev -> 0.1dev
spawn-fcgi: Add package
Merge pull request #2710 from lovek323/mpd

mpd: fix build on darwin
Merge pull request #2738 from jagajaga/moc_update

update moc
Merge pull request #2736 from matejc/updateseafile

seafile: update client, ccnet, libsearpc and shared
Merge pull request #2729 from iyzsong/renpy

renpy: update to 6.17.6
Merge pull request #2740 from ttuegel/clementine

clementine: disable unfree dependencies by default
monit: bump 5.8 -> 5.8.1 (bug fixes)
tibia: update 10.39 -> 10.40
Merge pull request #2744 from bjornfor/gnome-desktop-needs-gvfs

nixos: add 'gvfs' when using GNOME3 desktop