[libgit2-glib] Fix build

[Ignacio Casal Quinteiro <icq src gnome org>]

commit d265d507fe240638d2a6802cbb73ca86d8d46fb0
Author: Ignacio Casal Quinteiro <icq gnome org>
Date:   Tue Jul 14 20:23:56 2015 +0200

    Fix build

 libgit2-glib/ggit-object-factory.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libgit2-glib/ggit-object-factory.c b/libgit2-glib/ggit-object-factory.c
index c21e1c6..9fa997b 100644
--- a/libgit2-glib/ggit-object-factory.c
+++ b/libgit2-glib/ggit-object-factory.c
@@ -36,6 +36,8 @@ typedef struct
  */
 struct _GgitObjectFactory
 {
+       GObject parent_instance;
+
        GHashTable *typemap;
 };