[atk] Revert "atkimplementor: use the G_DEFINE_INTERFACE macro to declare it as interface in the introspec

[Alejandro Piñeiro <apinheiro src gnome org>]

commit 96d13ae47f6f77445483ee8a0d7d6569a95f35bf
Author: Alejandro Piñeiro <apinheiro igalia com>
Date:   Tue Feb 19 16:46:16 2019 +0100

    Revert "atkimplementor: use the G_DEFINE_INTERFACE macro to declare it as interface in the introspection"
    
    This reverts commit 30f2712c5bbffbc03e98272c852d29b4bdf8b52e.
    
    Fixes https://gitlab.gnome.org/GNOME/atk/issues/1

 atk/atkobject.c | 22 +++++++++++++++++-----
 atk/atkobject.h |  2 +-
 2 files changed, 18 insertions(+), 6 deletions(-)
---
diff --git a/atk/atkobject.c b/atk/atkobject.c
index f8e855e..d50be54 100644
--- a/atk/atkobject.c
+++ b/atk/atkobject.c
@@ -57,9 +57,6 @@
  *
  */
 
-typedef AtkImplementorIface AtkImplementorInterface;
-G_DEFINE_INTERFACE (AtkImplementor, atk_implementor, G_TYPE_OBJECT)
-
 static GPtrArray *role_names = NULL;
 
 enum
@@ -680,9 +677,24 @@ atk_object_init  (AtkObject        *accessible,
   accessible->role = ATK_ROLE_UNKNOWN;
 }
 
-static void
-atk_implementor_default_init (AtkImplementorInterface *iface)
+GType
+atk_implementor_get_type (void)
 {
+  static GType type = 0;
+
+  if (!type)
+    {
+      static const GTypeInfo typeInfo =
+      {
+        sizeof (AtkImplementorIface),
+        (GBaseInitFunc) NULL,
+        (GBaseFinalizeFunc) NULL,
+      } ;
+
+      type = g_type_register_static (G_TYPE_INTERFACE, "AtkImplementorIface", &typeInfo, 0) ;
+    }
+
+  return type;
 }
 
 /**
diff --git a/atk/atkobject.h b/atk/atkobject.h
index 4cb8ce2..711dda7 100644
--- a/atk/atkobject.h
+++ b/atk/atkobject.h
@@ -678,7 +678,7 @@ struct _AtkImplementorIface
 };
 
 ATK_AVAILABLE_IN_ALL
-GType atk_implementor_get_type (void) G_GNUC_CONST;
+GType atk_implementor_get_type (void);
 ATK_AVAILABLE_IN_ALL
 AtkObject*              atk_implementor_ref_accessible            (AtkImplementor *implementor);