[folks] eds: Add create_source_registry to eds-backend to fix build.

[Jeremy Whiting <jpwhiting src gnome org>]

commit f6e3807997b531a0fa05ca987d350d1374ef3c12
Author: Jeremy Whiting <jpwhiting kde org>
Date:   Fri Aug 10 17:00:53 2012 -0600

    eds: Add create_source_registry to eds-backend to fix build.

 backends/eds/eds-backend.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/backends/eds/eds-backend.vala b/backends/eds/eds-backend.vala
index a482ae2..b03f278 100644
--- a/backends/eds/eds-backend.vala
+++ b/backends/eds/eds-backend.vala
@@ -28,6 +28,11 @@ using Folks.Backends.Eds;
 
 extern const string BACKEND_NAME;
 
+/* The following function is needed in order to use the async SourceRegistry
+ * constructor. FIXME: https://bugzilla.gnome.org/show_bug.cgi?id=659886 */
+[CCode (cname = "e_source_registry_new", cheader_filename = "libedataserver/libedataserver.h", finish_function = "e_source_registry_new_finish")]
+internal extern static async E.SourceRegistry create_source_registry (GLib.Cancellable? cancellable = null) throws GLib.Error;
+
 /**
  * A backend which connects to EDS and creates a { link PersonaStore}
  * for each service.