Add a wrapper around the mdns interface implementation.
This might seem weird, but it's preparation to do more implementation work on Windows. Possibly also macOS, as it's weird that Avahi appears to be used and not Apple's version.
Testing Done:
Compile on both, and run on Linux.
Reviewed at https://reviews.imfreedom.org/r/315/
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
#
# Translators:
# Adrian Heine <mail@adrianheine.de>, 2017
# Andy Kleinert <Wawuschel@erweiterungen.de>, 2014-2017
# Björn Voigt <bjoernv@arcor.de>, 2014,2016-2018
# Eion Robb <eion@robbmob.com>, 2017
# Mario Siegmann <mario_siegmann@web.de>, 2014-2015
# Tobias Bannert <tobannert@gmail.com>, 2014-2016
# try once, 2015
# Andy Kleinert <Wawuschel@erweiterungen.de>, 2014
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