[PRQ#52510] Deletion Request for marco-gtk2

MarsSeed [1] filed a deletion request for marco-gtk2 [2]: Unneeded legacy MATE package from 2017; its consumers, mate-control-center-gtk2 (from same year) fails to build from source, and is submitted for deletion (PRQ#52450). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/marco-gtk2/