[bug#34523] Add tetrinet

[Ricardo Wurmus <rekado@elephly.net>]

pkill9@runbox.com writes:

> The license is written in the README as
>
> ```
> Distribution/license information
> --------------------------------
> This program is public domain, and may be modified and distributed without
> limitation.
> ```
>
> So I don't know what license to put it as, so I set it as 'expat'.

“expat” is not correct.  Use “public-domain” instead.

> +       #:phases (modify-phases %standard-phases
> +                  (delete 'configure)
> +                  (add-after 'unpack 'fix-install-dir
> +                    (lambda* (#:key outputs #:allow-other-keys)
> +                      (let ((out (assoc-ref outputs "out")))
> +                        (mkdir-p (string-append out "/bin"))
> +                        (substitute* "Makefile"
> +                          (("/usr/games") (string-append out "/bin")))))))))

Can this patching be avoided by passing a make flag instead?

--
Ricardo