[PRQ#46990] Deletion Request for openni-git

MarsSeed [1] filed a deletion request for openni-git [2]: Abandoned VCS build from 2015. Upstream not developed since 2013. [a] There's still a maintained openni package on AUR, as well as a separate openni2 and openni2-git for the successor library. Safe to delete this defunct PKGBUILD. [a]: https://github.com/OpenNI/OpenNI [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/openni-git/