audio/go-librespot: add port: Yet another open-source Spotify Connect client, written in Go

Yet another open-source Spotify Connect compatible client, written in Go.
go-librespot gives you the freedom to have a Spotify Connect device wherever
you want.

WWW: https://github.com/devgianlu/go-librespot

PR: 289388
Reported by: Alexandre Biancalana <ale@biancalanas.net> (new maintainer)