Return IAccessible from GetIAccessibleStd()

There's no reason to return an untyped void* pointer when we can
forward-declare IAccessible.

include/wx/msw/ole/access.h

@@ -17,6 +17,7 @@
 // forward declarations
 // ----------------------------------------------------------------------------
 
+struct IAccessible;
 class wxIAccessible;
 class WXDLLIMPEXP_FWD_CORE wxWindow;
 
@@ -42,7 +43,7 @@ public:
     wxIAccessible* GetIAccessible() { return m_pIAccessible; }
 
     // Returns the IAccessible standard interface pointer
-    void* GetIAccessibleStd() ;
+    IAccessible* GetIAccessibleStd();
 
 // Operations
 
@@ -55,7 +56,7 @@ protected:
 
 private:
     wxIAccessible * m_pIAccessible;  // the pointer to COM interface
-    void*           m_pIAccessibleStd;  // the pointer to the standard COM interface,
+    IAccessible*    m_pIAccessibleStd;  // the pointer to the standard COM interface,
                                         // for default processing
 
     wxDECLARE_NO_COPY_CLASS(wxAccessible);