[gnome-build-meta] core/gnome-music.bst: add new submodule

[Abderrahim Kitouni <akitouni src gnome org>]

commit 1475144c3ec023b38b05e474d928290f51b0c028
Author: Abderrahim Kitouni <akitouni gnome org>
Date:   Tue Jul 16 20:47:04 2019 +0100

    core/gnome-music.bst: add new submodule

 elements/core/gnome-music.bst | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/elements/core/gnome-music.bst b/elements/core/gnome-music.bst
index a7576410..c01beda8 100644
--- a/elements/core/gnome-music.bst
+++ b/elements/core/gnome-music.bst
@@ -7,6 +7,9 @@ sources:
     subprojects/libgd:
       checkout: True
       url: gitlab_gnome_org:GNOME/libgd.git
+    subprojects/gfm:
+      checkout: True
+      url: gitlab_gnome_org:mschraal/gfm.git
     subprojects/shared-modules:
       checkout: False
       url: github_com:flathub/shared-modules.git