Remove Windows CE support

Windows CE doesn't seem to be supported by Microsoft any longer. Last CE
release was in early 2013 and the PocketPC and Smartphone targets supported by
wxWidgets are long gone.

The build files where already removed in an earlier cleanup this commit
removes all files, every #ifdef and all documentation regarding the Windows CE
support.

Closes https://github.com/wxWidgets/wxWidgets/pull/81

src/msw/ole/oleutils.cpp

@@ -33,18 +33,8 @@
 
 #include "wx/msw/private.h"
 
-#ifdef __WXWINCE__
-    #include <winreg.h>
-    #include <ole2.h>
-
-    #define GUID_DEFINED
-    #define UUID_DEFINED
-#endif
-
 // OLE
-#ifndef __WXWINCE__
 #include  "wx/msw/ole/uuid.h"
-#endif
 
 #include  "wx/msw/ole/oleutils.h"
 #include "wx/msw/ole/safearray.h"
@@ -664,13 +654,9 @@ static wxString GetIidName(REFIID riid)
     }
   }
 
-#ifndef __WXWINCE__
   // unknown IID, just transform to string
   Uuid uuid(riid);
   return wxString((const wxChar *)uuid);
-#else
-  return wxEmptyString;
-#endif
 }
 
 WXDLLEXPORT void wxLogQueryInterface(const wxChar *szInterface, REFIID riid)