[PRQ#51115] Deletion Request for occi-core

MarsSeed [1] filed a deletion request for occi-core [2]: Defunct Ruby package. Safe to delete, along with its broken, discontinued consumer from 2017, occi-api (PRQ#51112). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/occi-core/