Prebuilt host binaries

arm64 and amd64 convenience builds; Fedora 44 systemd-networkd and Ubuntu 26.04 systemd rebuilt from the upstream source with the UseIPv6ResolvedGateway= patch, plus macOS v4gwd-arp and FreeBSD 15.1 v4gwd.

Built from the committed sources.

See each host's prebuilt/README.md.