[PRQ#62122] Deletion Request for libxfcegui4

MarsSeed [1] filed a deletion request for libxfcegui4 [2]: Obsolete gtk2 based library from 2012; no longer used by any working package. (Also any dependents would be incompatible with today's xfce4 with gtk3, as the project has transitioned to the latter toolkit around 2019.) [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libxfcegui4/