In bug 635207, it was pointed out that it is a bad idea to
rename these tools purely in the name of parallel-installability,
since it forces dependencies to make a choice between running
gtk-update-icon-cache and gtk-update-icon-cache-3.0 (or both ?!).
So, we rename these utilities back to their un-suffixed names
and rely on distributors to resolve the conflict between GTK+ 2.x
and GTK+ 3.0 packages, which can be done e.g. by dropping the
utilities from the gtk3 packages and add a gtk3 -> gtk2 dependency.
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