[PRQ#48719] Deletion Request for cabocha

MarsSeed [1] filed a deletion request for cabocha [2]: Cleanup of unused library from 2019, in the form of a disguised VCS pkg without pkgver() function. Safe to delete: neither it nor its Python2/Python3 bindings have consumers (PRQ#48717, PRQ#48718). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/cabocha/