Move xmobar back from Guix to Nix

xmobar is probably missing some build inputs, as it can't show the
volume.  According to the documentation [0], the "alsa-mixer" and
"libasound" packages need to be installed for that to work.  I tried
adding "alsa-lib" as an input to the xmobar package, but it didn't work.
Everything else works correctly (even the font choice, which doesn't
work with the Nix version of the package), but xmobar emits a constant
warning (about 1/s):

  ALSA lib control.c:1410:(snd_ctl_open_conf) Unknown field libs

and the "Volume" section shows as "Vol: N/A% N/A" instead of
"Updating...", which is what usually happens when an error occurs.

So I'm sticking to the Nix version of xmobar, since I'm not (yet) using
xmobar in my Guix installation (yet).

[0]: https://archives.haskell.org/projects.haskell.org/xmobar/

0 files changed, 0 insertions, 0 deletions