[PRQ#52519] Deletion Request for mate-system-monitor-gtk2

MarsSeed [1] filed a deletion request for mate-system-monitor-gtk2 [2]: Fails to build on current Arch Linux, just like the majority of MATE- Gtk2 components from 2017 on AUR. Not useful to keep. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/mate-system-monitor-gtk2/