[bug#68448] Add guile-rsv package definition.

[Yuval Langer]

Hi,

this library implements the Rows of String Vectors file format as
specified by Stenway[1], an alternative to Comma Separated Values and
similar file formats.

It also provides two commands, rsv2scm and scm2rsv, for reading and
writing RSV files to and from a list of lists of strings.

The main repository is on Codeberg[2].

Many thanks,
Yuval Langer.

[1]: https://github.com/Stenway/RSV-Specification
[2]: https://codeberg.org/kakafarm/guile-rsv

0001-Add-guile-rsv-package-definition.patch
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