[gnome-build-meta] core/gnome-bluetooth: add libhandy submodule

[Abderrahim Kitouni <akitouni src gnome org>]

commit d66b8206b65b294f0098eb4942826dc09e70e5da
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Wed Jan 30 21:37:29 2019 +0100

    core/gnome-bluetooth: add libhandy submodule

 elements/core/gnome-bluetooth.bst | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/elements/core/gnome-bluetooth.bst b/elements/core/gnome-bluetooth.bst
index 8518c4ee..9bb652b4 100644
--- a/elements/core/gnome-bluetooth.bst
+++ b/elements/core/gnome-bluetooth.bst
@@ -3,6 +3,10 @@ sources:
 - kind: git
   url: gitlab_gnome_org:GNOME/gnome-bluetooth
   track: master
+  submodules:
+    subprojects/libhandy:
+      url: purism:Librem5/libhandy.git
+      checkout: True
 depends:
 - sdk/glib.bst
 - sdk/gtk+-3.bst