bug#47195: xboard: alsa-utils dependency

[Christopher Howard]

xboard package needs to be explicitly dependent on alsa-utils, since it
uses the `aplay' utility to play sounds. I think this maybe wasn't
noticed before because alsa-utils used to be a common part of the
desktop environment.

christopher@nightshade ~$ guix describe
Generation 2    Feb 25 2021 21:06:30    (current)
  guix 6294299
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 62942992831249d6d1c047c0a11c41d2ecccc4fc

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Christopher Howard
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