[PRQ#46162] Deletion Request for openfoam3.0-git

MarsSeed [1] filed a deletion request for openfoam3.0-git [2]: Development discontinued since 2017. [a] I think there's not much point in keeping this VCS package. [a]: https://github.com/OpenFOAM/OpenFOAM-3.0.x [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/openfoam3.0-git/