[epiphany/mcatanzaro/#929] Pass --nonet to appstream-util

[Michael Catanzaro <mcatanzaro src gnome org>]

commit e952d21c5ee86947dad8f393ea71485f1ea17e59
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sun Sep 15 10:05:16 2019 -0500

    Pass --nonet to appstream-util
    
    Fixes #929

 data/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/meson.build b/data/meson.build
index 2d7a6cedd..f79d470f2 100644
--- a/data/meson.build
+++ b/data/meson.build
@@ -136,7 +136,7 @@ if appstream_util.found()
   test(
     'validate-appdata', appstream_util,
     args: [
-      'validate-relax', appdata.full_path()
+      'validate-relax', '--nonet', appdata.full_path()
     ]
   )
 endif