games-arcade/gnome-robots: use subslot operator for libgnome-games-support

libgnome-games-support-1.4.x will bump soname
Also downgrade yelp-tools dep to just itstool while here (yelp-tools is only
for developers, so an eautoreconf dep only, if even that).

Package-Manager: Portage-2.3.49, Repoman-2.3.10

games-arcade/gnome-robots/gnome-robots-3.22.3.ebuild

@@ -14,15 +14,15 @@ IUSE=""
 
 RDEPEND="
 	>=dev-libs/glib-2.32:2
-	dev-libs/libgnome-games-support:1
+	dev-libs/libgnome-games-support:1=
 	>=gnome-base/librsvg-2.36.2:2
 	>=media-libs/libcanberra-0.26[gtk3]
 	>=x11-libs/gtk+-3.15:3
 "
 DEPEND="${RDEPEND}
-	app-text/yelp-tools
 	dev-libs/appstream-glib
 	>=dev-util/intltool-0.50
+	dev-util/itstool
 	sys-devel/gettext
 	virtual/pkgconfig
 "