[libadwaita/wip/exalm/test] tests: Don't glib 2.68 API unless available

[Alexander Mikhaylenko <alexm src gnome org>]

commit 00bbdd32f77965ebba464ff31b6656fa1bcdaa22
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed Jul 13 18:59:03 2022 +0400

    tests: Don't glib 2.68 API unless available
    
    Missed this one - we depend on 2.66 and not 2.68 - same as GTK4.

 tests/test-about-window.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/tests/test-about-window.c b/tests/test-about-window.c
index f9c8f6b7..6825553f 100644
--- a/tests/test-about-window.c
+++ b/tests/test-about-window.c
@@ -79,10 +79,12 @@ test_adw_about_window_create (void)
   g_assert_cmpstr (adw_about_window_get_support_url (window), ==, "https://example.org";);
   g_assert_cmpstr (adw_about_window_get_debug_info (window), ==, "Debug");
   g_assert_cmpstr (adw_about_window_get_debug_info_filename (window), ==, "debug.txt");
+#if GLIB_CHECK_VERSION (2, 68, 0)
   g_assert_cmpstrv (adw_about_window_get_developers (window), developers);
   g_assert_cmpstrv (adw_about_window_get_designers (window), designers);
   g_assert_cmpstrv (adw_about_window_get_artists (window), artists);
   g_assert_cmpstrv (adw_about_window_get_documenters (window), documenters);
+#endif
   g_assert_cmpstr (adw_about_window_get_translator_credits (window), ==, "translator-credits");
   g_assert_cmpstr (adw_about_window_get_copyright (window), ==, "© 2022 Angela Avery");
   g_assert_cmpuint (adw_about_window_get_license_type (window), ==, GTK_LICENSE_GPL_3_0);