[PRQ#57942] Deletion Request for ocaml-gd4o

MarsSeed [1] filed a deletion request for ocaml-gd4o [2]: No longer needed. Broken, unbuildable ocaml library from 2003. [a] Cleanup after the deletion of the ocaml4-only, 1.5+ years broken liquidsoap (PRQ#57940). [a]: https://sourceforge.net/projects/gd4o/files/ [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ocaml-gd4o/