[ 1721029 ] [GTK] memory leak in wxMenu

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@46167 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/menu.cpp

@@ -1030,6 +1030,7 @@ wxMenu::~wxMenu()
    {
        // see wxMenu::Init
        gtk_widget_unref( m_menu );
+       g_object_unref( m_accel );
        // if the menu is inserted in another menu at this time, there was
        // one more reference to it:
        if ( m_owner )