buildroot

s6-dns: new package

This new package provides s6-dns, a suite of DNS client programs and
libraries for Unix systems, as an alternative to the BIND, djbdns or
other DNS clients.

Signed-off-by: Eric Le Bihan <eric.le.bihan.dev@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>