[PRQ#51777] Merge Request for rtl-sdr-keenerd-git

MarsSeed [1] filed a request to merge rtl-sdr-keenerd-git [2] into rtl-sdr-librtlsdr-git [3]: Instead of my old deletion request (PRQ#46215 from 2023-08-13), I'm now submitting a merge request, which makes more sense. rtl-sdr-keenerd fork has been discontinued since 2016. [a] rtl-sdr-librtlsdr-git's sources have been updated this year (Apr 2023 as of this writing). [a]: https://github.com/keenerd/rtl-sdr [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/rtl-sdr-keenerd-git/ [3] https://aur.archlinux.org/pkgbase/rtl-sdr-librtlsdr-git/