[PRQ#52925] Deletion Request for gtkhtml4

MarsSeed [1] filed a deletion request for gtkhtml4 [2]: Defunct. Discontinued by upstream since 2015. Nothing depend on it anymore. Safe to delete. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gtkhtml4/