nslookup's Server: 0.0.0.0 but resolves correctly

[stroblsw at gmail.com]

>
> $ /usr/local/bin/busybox nslookup example.com
> Server:    (null)
> Address 1: (null)
> Address 2: 127.0.0.1 localhost.localdomain
>
> Name:      example.com
> Address 1: (null)
> Address 2: 93.184.216.119

okay, it's not just bionic but musl too.

the musl resolution looks particularly evil with address1 being null.
I didn't dare to suggest this before but if musl was trying to resolve
the IPv6 address there to null then maybe this bug is related to
ENABLE_FEATURE_IPV6