`rpc_bind` uses `all_interfaces` to find a non-loopback IPv4 address and `get_bind_addrs` to verify the node's listening sockets.
Add `all_interfaces` support for macOS, FreeBSD, NetBSD, and OpenBSD using `ifconfig -au`, switch the test to the POSIX platform guard so it runs there too, and fail early if no IPv4 interfaces are returned.
Co-authored-by: Sjors Provoost <sjors@sprovoost.nl>