[gnome-games] flatpak: Add libmanette

[Adrien Plazas <aplazas src gnome org>]

commit 1a139c1b7b5943ac6f2929e1814ad0800d82ea5f
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Nov 9 09:41:24 2017 +0100

    flatpak: Add libmanette
    
    This is needed to introduce a dependency on libmanette in the next
    commits.

 flatpak/org.gnome.Games.json |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/flatpak/org.gnome.Games.json b/flatpak/org.gnome.Games.json
index 5ddb3ea..c375f62 100644
--- a/flatpak/org.gnome.Games.json
+++ b/flatpak/org.gnome.Games.json
@@ -126,6 +126,16 @@
             ]
         },
         {
+            "name": "libmanette",
+            "buildsystem": "meson",
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://gitlab.gnome.org/aplazas/libmanette.git";
+                }
+            ]
+        },
+        {
             "name": "retro-gtk",
             "buildsystem": "meson",
             "sources": [