dnsapi: Switch from libresolv to libbind for DNS support.

[Hans Leidekker]

This patch presents an alternative to the one I sent a while ago
that adds two source files from libbind. The advantage of this
alternative is that it brings DNS message parsing support and DNS
update support, without adding files from external projects.

The drawback is that libbind appears to be packaged only as a static
library on Debian based systems, whereas libresolv is available as a
shared library on virtually every system. libbind.a is 428694 bytes
in size on my Kubuntu system and 546908 bytes in size on my Fedora
system.

 -Hans

Changelog
  Switch from libresolv to libbind for DNS support.
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