Removed the code related to gtk_window_set_icon_list. This code doesn't gain us much and will have even less impact in the future.
Testing Done:
Compiled, ran, verified that calling `gtk_window_set_icon_list(window, NULL);` doesn't crash. I couldn't actually check what a window manager will display because my window manager doesn't show icons.
Reviewed at https://reviews.imfreedom.org/r/77/
# 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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"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2019-11-10 20:23-0500\n"
"PO-Revision-Date: 2018-01-30 19:08+0000\n"
"Last-Translator: Björn Voigt <bjoernv@arcor.de>\n"
"Language-Team: German (http://www.transifex.com/pidgin/pidgin/language/de/)\n"