Currently net-dns/bind ebuild forcefully DEPENDs on net-dns/resolvconf-gentoo, which is deprecated in favour of net-dns/openresolv. Is there anything wrong in changing the dependency from "resolvconf? ( net-dns/resolvconf-gentoo )" to "resolvconf? ( || ( net-dns/resolvconf-gentoo net-dns/openresolv ) )" ? Also I cannot understand why resolvconf is listed in DEPEND instead of RDEPEND.
This is fixed in bind-9.4.2. Thanks for reporting!