[gnome-contacts] Pass --nonet to appstream-util

[Niels De Graef <nielsdg src gnome org>]

commit ddd91b107ceb3b44a0f08f90d5db2212d5e9c9c5
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Thu Dec 20 13:48:34 2018 +0000

    Pass --nonet to appstream-util
    
    Flatpak builds doesn't have network access. We run the ninja tests there.
    The network is only used to fetch the screenshots and validate them.
    Make sure they are always valid by running the tests locally before updating the screenshots.

 data/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/meson.build b/data/meson.build
index ebeb6c7..dd18c95 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -46,7 +46,7 @@ if appstream_util.found()
   test(
     'validate-appdata', appstream_util,
     args: [
-      'validate-relax', appdata_file.full_path()
+      'validate-relax', '--nonet', appdata_file.full_path()
     ]
   )
 endif