use G_VALUE_INIT

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75163 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/private.h

@@ -16,6 +16,11 @@
 #include "wx/gtk/private/string.h"
 #include "wx/gtk/private/gtk2-compat.h"
 
+#ifndef G_VALUE_INIT
+    // introduced in GLib 2.30
+    #define G_VALUE_INIT { 0, { { 0 } } }
+#endif
+
 // pango_version_check symbol is quite recent ATM (4/2007)... so we
 // use our own wrapper which implements a smart trick.
 // Use this function as you'd use pango_version_check: