[gtk+] build: Add widgetorder unit test to build system

[Timm Bäder <baedert src gnome org>]

commit 18837248a6fcb8391d9a867e5045ff970b66bf81
Author: Timm Bäder <mail baedert org>
Date:   Fri Sep 29 12:10:42 2017 +0200

    build: Add widgetorder unit test to build system

 testsuite/gtk/meson.build |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index 5c6e885..90aa2f8 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -48,6 +48,7 @@ tests = [
   ['window'],
   ['displayclose'],
   ['revealer-size'],
+  ['widgetorder'],
 ]
 
 test_env = environment()