devel/luv: Update to 1.44.2-1

Also, remove the backend selection options. This port is only used
by Neovim, and the Neovim port only uses luajit-openresty, so there's
no real benefit to supporting multiple backends that will break luv's
only consumer.

Take maintainership. The maintainer hasn't responded to PRs, and all
mail is bouncing because secmail.pro doesn't appear to exist anymore.

PR: 266321