[gnome-control-center] flatpak: Add libnma

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 9c080d09a7e3dbafee471a494972599d86c3fc2b
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Mar 6 12:03:50 2020 +0100

    flatpak: Add libnma
    
    This is needed by network-manager-applet.

 build-aux/flatpak/org.gnome.Settings.json | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Settings.json b/build-aux/flatpak/org.gnome.Settings.json
index be8ce9063..f3fe2b07c 100644
--- a/build-aux/flatpak/org.gnome.Settings.json
+++ b/build-aux/flatpak/org.gnome.Settings.json
@@ -379,6 +379,22 @@
                 }
             ]
         },
+        {
+            "name" : "libnma",
+            "buildsystem" : "meson",
+            "config-opts" : [
+                "-Dgtk_doc=false",
+                "-Dintrospection=false",
+                "-Dmobile_broadband_provider_info=false",
+                "-Dvapi=false"
+            ],
+            "sources" : [
+                {
+                    "type" : "git",
+                    "url" : "https://gitlab.gnome.org/GNOME/libnma.git";
+                }
+            ]
+        },
         {
             "name" : "network-manager-applet",
             "buildsystem" : "meson",