gnu: artanis: Remove implied $(DESTDIR) usage.

[Adonay Felipe Nogueira]

My first patch to Guix project, I hope this helps. :)
-- 
# pt-BR: Brasileiro | en: Brazilian

* pt-BR: Palestra sobre liberdade de software (movimento filosófico 
político-social, não tecnológico).
  * en: Gives talks about software freedom (philosophical, political and social 
movement, not technological).
* pt-BR: Voluntário avaliador de liberdade de software (para software pagos ou 
gratuitos).
  * en: Volunteer evaluator of software freedom (for paid software, or gratis 
software).
* pt-BR: Presta suporte e consultoria básicos sobre software livre.
  * en: Gives basic support and consulting about free/libre software.

## pt-BR: Sobre mim e contato | en: About me and contact
<https://libreplanet.org/wiki/User:Adfeno>

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