[libgames-support] scores: Make the importers GObjects

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5510121b97f5175c129982dbabdc45eed877fd1f
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sat Feb 13 18:03:50 2016 -0600

    scores: Make the importers GObjects
    
    I only noticed this mistake by inspecting the generated code. I had no
    intention of screwing around with fundamental types; not pleased this is
    so easy to screw up....

 games/scores/importer.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/games/scores/importer.vala b/games/scores/importer.vala
index 764606e..87ea2f0 100644
--- a/games/scores/importer.vala
+++ b/games/scores/importer.vala
@@ -63,7 +63,7 @@ namespace Scores {
  * loaded before showing the main window.
  */
 
-public abstract class Importer
+public abstract class Importer : Object
 {
     protected abstract void importOldScores (File new_scores_dir) throws GLib.Error;