Add a gtk-update-icon-cache subpackage

Instead of building it as part of gtk2, move gtk-update-icon-cache here
and package it up in a subpackage. This makes it possible for both gtk2
and gtk3 to depend on the new subpackage.

gtk3.spec

@@ -35,7 +35,6 @@ BuildRequires: cairo-devel >= %{cairo_version}
 BuildRequires: cairo-gobject-devel >= %{cairo_version}
 BuildRequires: pango-devel >= %{pango_version}
 BuildRequires: gdk-pixbuf2-devel >= %{gdk_pixbuf_version}
-BuildRequires: gtk2-devel
 BuildRequires: libXi-devel
 BuildRequires: gettext
 BuildRequires: gtk-doc
@@ -66,6 +65,8 @@ BuildRequires: libxkbcommon-devel
 Requires: adwaita-icon-theme
 # required for icon theme apis to work
 Requires: hicolor-icon-theme
+# split out in a subpackage
+Requires: gtk-update-icon-cache
 
 # We need to prereq these so we can run gtk-query-immodules-3.0
 Requires(post): glib2%{?_isa} >= %{glib2_version}
@@ -96,6 +97,17 @@ suites.
 
 This package contains version 3 of GTK+.
 
+%package -n gtk-update-icon-cache
+Summary: Icon theme caching utility
+# gtk-update-icon-cache used to be shipped in the gtk2 package
+Conflicts: gtk2 < 2.24.25-2
+
+%description -n gtk-update-icon-cache
+GTK+ can use the cache files created by gtk-update-icon-cache to avoid a lot of
+system call and disk seek overhead when the application starts. Since the
+format of the cache files allows them to be mmap()ed shared between multiple
+applications, the overall memory consumption is reduced as well.
+
 %package immodules
 Summary: Input methods for GTK+
 Group: System Environment/Libraries
@@ -152,7 +164,6 @@ the functionality of the installed %{name} package.
 
 (if ! test -x configure; then NOCONFIGURE=1 ./autogen.sh; CONFIGFLAGS=--enable-gtk-doc; fi;
  %configure $CONFIGFLAGS \
-        --enable-gtk2-dependency \
         --enable-xkb \
         --enable-xinerama \
         --enable-xrandr \
@@ -257,7 +268,6 @@ gtk-query-immodules-3.0-%{__isa_bits} --update-cache
 %ghost %{_libdir}/gtk-3.0/%{bin_version}/immodules.cache
 %{_mandir}/man1/gtk-query-immodules-3.0*
 %{_mandir}/man1/gtk-launch.1.gz
-%exclude %{_mandir}/man1/gtk-update-icon-cache.1.gz
 %{_datadir}/glib-2.0/schemas/org.gtk.Settings.FileChooser.gschema.xml
 %{_datadir}/glib-2.0/schemas/org.gtk.Settings.ColorChooser.gschema.xml
 %{_datadir}/glib-2.0/schemas/org.gtk.Settings.Debug.gschema.xml
@@ -267,6 +277,11 @@ gtk-query-immodules-3.0-%{__isa_bits} --update-cache
 %{_mandir}/man1/broadwayd.1*
 %endif
 
+%files -n gtk-update-icon-cache
+%doc COPYING
+%{_bindir}/gtk-update-icon-cache
+%{_mandir}/man1/gtk-update-icon-cache.1*
+
 %files immodules
 %{_libdir}/gtk-3.0/%{bin_version}/immodules/im-cedilla.so
 %{_libdir}/gtk-3.0/%{bin_version}/immodules/im-am-et.so
@@ -322,6 +337,7 @@ gtk-query-immodules-3.0-%{__isa_bits} --update-cache
 %changelog
 * Wed Dec 17 2014 Kalev Lember <kalevlember@gmail.com> - 3.15.3-1
 - Update to 3.15.3
+- Add gtk-update-icon-cache subpackage that both gtk2 and gtk3 can depend on
 
 * Mon Nov 24 2014 Kalev Lember <kalevlember@gmail.com> - 3.15.2-1
 - Update to 3.15.2