Draft: community/iwd: default to resolvconf & depend on openresolv

Closes #14406 (closed)

Normally I'd avoid dependency creep like this but here I'd like to argue that many iwd users would want to use it like this (I do), openresolv is tiny and iwd will not start without it if not available, as reported above. Still, I do not have a strong opinion on this, we could instead patch the documentation to suggest installing the openresolv aport when using resolvconf.

VoidLinux default to resolvconf https://github.com/void-linux/void-packages/blob/master/srcpkgs/iwd/patches/resolvconf-default.patch

Upstream also enabled IPv6 by default but forgot to update a tiny bit of the documentation, take this opportunity to also patch that.