[nautilus] Meson: validate appdata file without network access

[Carlos Soriano <csoriano src gnome org>]

commit 62a28f0e4d99f436e2f5f630424377b48ef1072d
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Tue Jan 15 11:24:44 2019 +0000

    Meson: validate appdata file without network access
    
    Network access is restricted on Flatpak build env, the same with other distros running tests for packages 
during the build process without network access. Fixes the pipeline from failing.

 data/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/meson.build b/data/meson.build
index e7b67819f..c52a9695f 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -132,7 +132,7 @@ if appstream_util.found()
   test(
     'validate-appdata', appstream_util,
     args: [
-      'validate-relax', appdata.full_path()
+      'validate-relax', '--nonet', appdata.full_path()
     ]
   )
 endif