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In GTK frontend, bind mouse8/mouse9 to undo/redo.

These button codes are generated by the back/forward button pair on
the sides of some mice, and web browsers treat these as the back and
forward actions in the page history.

--- a/gtk.c

+++ b/gtk.c

@@ -1205,10 +1205,14 @@

 	button = RIGHT_BUTTON;

     else if (event->button == 1)

 	button = LEFT_BUTTON;

+    else if (event->button == 8 && event->type == GDK_BUTTON_PRESS)

+        button = 'u';

+    else if (event->button == 9 && event->type == GDK_BUTTON_PRESS)

+        button = 'r';

     else

 	return FALSE;		       /* don't even know what button! */

-    if (event->type == GDK_BUTTON_RELEASE)

+    if (event->type == GDK_BUTTON_RELEASE && button >= LEFT_BUTTON)

         button += LEFT_RELEASE - LEFT_BUTTON;

     if (!midend_process_key(fe->me, event->x - fe->ox,