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:
# Werewolf <alvar@raamat.polva.ee>, 2013
# boamaod <boamaod@gmail.com>, 2011
# Georg, 2014
# boamaod <boamaod@gmail.com>, 2011
# Ivar Smolin <okul@linux.ee>, 2011
# Maemees <olav.magi@hotmail.com>, 2011
# Mattias Põldaru <mahfiaz@gmail.com>, 2011
# Maemees <olav.magi@hotmail.com>, 2011
# Richard Laager <rlaager@wiktel.com>, 2011
# Werewolf <alvar@raamat.polva.ee>, 2013
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