[PRQ#46153] Deletion Request for xrootd4

MarsSeed [1] filed a deletion request for xrootd4 [2]: Orphan legacy version of xrootd, nothing needs this on AUR. Repo carries the current release. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/xrootd4/