games-kids/gmult: fix build with meson-0.61.4

meson-0.61.4's gnome module now checks that gtk4-update-icon-cache is
available if updating cache is requested (was ignored with <=0.61.3),
simply skip given this should be handled by xdg.eclass either way.

Closes: https://bugs.gentoo.org/836294
Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

games-kids/gmult/files/gmult-10.0-no-icon-cache.patch

@@ -0,0 +1,8 @@
+https://bugs.gentoo.org/836294
+--- a/data/meson.build
++++ b/data/meson.build
+@@ -56,3 +56,3 @@
+ gnome.post_install(
+-    gtk_update_icon_cache: true,
++    gtk_update_icon_cache: false,
+ )

games-kids/gmult/gmult-10.0.ebuild

@@ -26,6 +26,10 @@ BDEPEND="
 	$(vala_depend)
 	sys-devel/gettext"
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-10.0-no-icon-cache.patch
+)
+
 DOCS=( NEWS.md README.md )
 
 src_configure() {