[PRQ#51245] Deletion Request for libclc12-git

MarsSeed [1] filed a deletion request for libclc12-git [2]: Unneeded VCS package from 2021, tracking the discontinued v12 release branch. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libclc12-git/