don't clear m_items before deleting m_menu (partial backport of r49263)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@51361 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/menucmn.cpp

@@ -470,8 +470,6 @@ void wxMenuBase::Init(long style)
 wxMenuBase::~wxMenuBase()
 {
     WX_CLEAR_LIST(wxMenuItemList, m_items);
-
-    // Actually, in GTK, the submenus have to get deleted first.
 }
 
 // ----------------------------------------------------------------------------

src/gtk/menu.cpp

@@ -1070,8 +1070,6 @@ void wxMenu::Init()
 
 wxMenu::~wxMenu()
 {
-   WX_CLEAR_LIST(wxMenuItemList, m_items);
-
    if ( GTK_IS_WIDGET( m_menu ))
    {
        // see wxMenu::Init