Further gi.require_version calls

Activity logs have continued to report GObject Introspection version
warnings.

src/sugar3/activity/activity.py

@@ -64,9 +64,14 @@ import StringIO
 import cairo
 import json
 
-from gi.repository import Gtk
+import gi
-from gi.repository import Gdk
+gi.require_version('Gtk', '3.0')
+gi.require_version('Gdk', '3.0')
+gi.require_version('SugarExt', '1.0')
+
 from gi.repository import GObject
+from gi.repository import Gdk
+from gi.repository import Gtk
 import dbus
 import dbus.service
 from dbus import PROPERTIES_IFACE

src/sugar3/graphics/palettewindow.py

@@ -26,6 +26,9 @@ STABLE.
 import logging
 import math
 
+import gi
+gi.require_version('SugarGestures', '1.0')
+
 from gi.repository import Gdk
 from gi.repository import Gtk
 from gi.repository import GObject