[gtk] Add the label-wrap-justify reftest to xfails

[Matthias Clasen <matthiasc src gnome org>]

commit 5e746d35b2c5ab8601b493d4f8ca4784328d50fa
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 10 15:19:13 2020 -0500

    Add the label-wrap-justify reftest to xfails
    
    Seems just like the other label tests, down to details
    of text rendering.

 testsuite/reftests/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/testsuite/reftests/meson.build b/testsuite/reftests/meson.build
index 33ecccbe5a..0d81cfc98e 100644
--- a/testsuite/reftests/meson.build
+++ b/testsuite/reftests/meson.build
@@ -428,6 +428,7 @@ xfails = [
   'window-show-contents-on-map.ui',
   # these depend on details of text layout
   'label-sizing.ui',
+  'label-wrap-justify.ui',
 ]
 
 foreach testname : testdata