[SHELL32] Remove some unused members and comment out some unused Wine code. CORE-11799 (#94)

dll/win32/shell32/shellmenu/CMenuFocusManager.h

···
     INT   m_selectedItem;
     DWORD m_selectedItemFlags;
 
-    BOOL m_isLButtonDown;
     BOOL m_movedSinceDown;
     HWND m_windowAtDown;
 

dll/win32/shell32/shellmenu/CMenuToolbars.cpp

···
 CMenuToolbarBase::CMenuToolbarBase(CMenuBand *menuBand, BOOL usePager) :
     m_pager(this, 1),
     m_useFlatMenus(FALSE),
-    m_SubclassOld(NULL),
     m_disableMouseTrack(FALSE),
     m_timerEnabled(FALSE),
     m_menuBand(menuBand),

dll/win32/shell32/shellmenu/CMenuToolbars.h

···
 private:
     HFONT   m_marlett;
     BOOL    m_useFlatMenus;
-    WNDPROC m_SubclassOld;
     BOOL    m_disableMouseTrack;
     BOOL    m_timerEnabled;
 

dll/win32/shell32/wine/shellole.c

···
  *  When the CreateInstance of the cf is called the callback is executed.
  */
 
+#ifndef __REACTOS__
+
 typedef struct
 {
     IClassFactory               IClassFactory_iface;
···
 {
 	return CONTAINING_RECORD(iface, IDefClFImpl, IClassFactory_iface);
 }
-
-#ifndef __REACTOS__
 
 static const IClassFactoryVtbl dclfvt;