[PRQ#51604] Merge Request for tetherback

MarsSeed [1] filed a request to merge tetherback [2] into tetherback- git [3]: As upstream has not released any new versions since 2016 [a], I propose this package merge. Master branch continually receives maintenance fixes as necessary. [b] [a]: https://github.com/dlenski/tetherback/releases [b]: https://github.com/dlenski/tetherback/compare/v0.9.1...master [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/tetherback/ [3] https://aur.archlinux.org/pkgbase/tetherback-git/