[bug#44518] gnu: Add matterhorn.

[(]

Hi,

This patch must have slipped through the cracks, but it was mentioned
on IRC today, so I decided to do a little review :)

First of all,

(1) You should have one commit per package.
(2) It's better, though not required, to use the procedure described here[1]
    to send patches, instead of using attachments. This makes it much easier
    to annotate the patch with review comments, at least here in aerc :)

[1] 
https://paste.sr.ht/~unmatched-paren/9114b1fa3d2088c7c71307dcae0d9e2b3620eb0c

> +    (inputs
> +     `(("ghc-random" ,ghc-random)
> +       ("ghc-quickcheck" ,ghc-quickcheck)
> +       ("ghc-semigroupoids" ,ghc-semigroupoids)))

You should use the "new style" of inputs:

> +    (inputs
> +     (list ghc-random
> +           ghc-quickcheck
> +           ghc-semigroupoids))

Same for any native- and propagated- inputs.

> +    (arguments
> +     `(#:cabal-revision
> +       ("3" "1ndz5x6njl35h73il5c6qpaqd4ynvg21n6k7sb8aq09gfbg544d8")))

There's also a new arguments style:

> +    (arguments
> +     (list #:cabal-revision
> +           (list "3" 
> "1ndz5x6njl35h73il5c6qpaqd4ynvg21n6k7sb8aq09gfbg544d8")))

> +    (description
> +     "This library is intended to be a comprehensive solution to parsing and
> +selecting quality-indexed values in HTTP headers.  It is capable of parsing
> +both media types and language parameters from the Accept and Content header
> +families, and can be extended to match against other accept headers as well.
> +Selecting the appropriate header value is achieved by comparing a list of
> +server options against the quality-indexed values supplied by the client.")

This is a wee bit too long IMO.

    -- (