[gtk+/gtk-2-24] Disable deprecation warnings for tests

[Matthias Clasen <matthiasc src gnome org>]

commit 43ece862f326673639f68dc1fabd860a22f91526
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 10 11:44:54 2014 -0400

    Disable deprecation warnings for tests
    
    This is a change in newer GLib which breaks make check if we
    don't disable it.

 gtk/tests/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/tests/Makefile.am b/gtk/tests/Makefile.am
index 615b28e..3f97df7 100644
--- a/gtk/tests/Makefile.am
+++ b/gtk/tests/Makefile.am
@@ -20,6 +20,7 @@ progs_ldadd = \
 
 noinst_PROGRAMS = $(TEST_PROGS)
 
+TESTS_ENVIRONMENT = G_ENABLE_DIAGNOSTIC=0
 
 TEST_PROGS                     += testing
 testing_SOURCES                         = testing.c