[gtk+] testsuite: Use the cairo renderer for now

[Matthias Clasen <matthiasc src gnome org>]

commit 2a71a4382a6e8a9a18f6160e5943cb951e25dc42
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Oct 17 17:35:28 2017 +0800

    testsuite: Use the cairo renderer for now

 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 90aa2f8..2afb14a 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -57,6 +57,7 @@ test_env.set('G_TEST_BUILDDIR', meson.current_build_dir())
 test_env.set('G_ENABLE_DIAGNOSTIC', '0')
 test_env.set('GIO_USE_VFS', 'local')
 test_env.set('GSETTINGS_BACKEND', 'memory')
+test_env.set('GSK_RENDERER', 'cairo')
 
 test_cargs = []