[iagno] Build GSound in Flatpak.

[Arnaud B. <arnaudb src gnome org>]

commit 002f2c4809d19ff7033e74d464c33cbb39cd5b19
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Jul 24 17:15:24 2019 +0200

    Build GSound in Flatpak.
    
    Looks like it is needed.

 org.gnome.Reversi.json | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/org.gnome.Reversi.json b/org.gnome.Reversi.json
index 5a500af..714d2a3 100644
--- a/org.gnome.Reversi.json
+++ b/org.gnome.Reversi.json
@@ -31,6 +31,16 @@
         "*.a"
     ],
     "modules" : [
+        {
+            "name" : "gsound",
+            "buildsystem" : "autotools",
+            "sources" : [
+                {
+                    "type" : "git",
+                    "url" : "https://gitlab.gnome.org/GNOME/gsound.git";
+                }
+            ]
+        },
         {
             "name" : "iagno",
             "buildsystem": "meson",