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/cursor.cpp

@@ -145,10 +145,8 @@ void wxCursorRefData::Free()
 {
     if ( m_hCursor )
     {
-#ifndef __WXWINCE__
         if ( m_destroyCursor )
             ::DestroyCursor((HCURSOR)m_hCursor);
-#endif
 
         m_hCursor = 0;
     }
@@ -223,12 +221,10 @@ wxCursor::wxCursor(const wxString& filename,
             hcursor = ::LoadCursor(wxGetInstance(), filename.t_str());
             break;
 
-#ifndef __WXWINCE__
         case wxBITMAP_TYPE_ANI:
         case wxBITMAP_TYPE_CUR:
             hcursor = ::LoadCursorFromFile(filename.t_str());
             break;
-#endif
 
         case wxBITMAP_TYPE_ICO:
             hcursor = wxBitmapToHCURSOR