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

include/wx/msw/ole/oleutils.h

@@ -37,11 +37,7 @@
 inline bool wxOleInitialize()
 {
     HRESULT
-#ifdef __WXWINCE__
-     hr = ::CoInitializeEx(NULL, COINIT_MULTITHREADED);
-#else
-     hr = ::OleInitialize(NULL);
-#endif
+    hr = ::OleInitialize(NULL);
 
     // RPC_E_CHANGED_MODE indicates that OLE had been already initialized
     // before, albeit with different mode. Don't consider it to be an error as
@@ -60,11 +56,7 @@ inline bool wxOleInitialize()
 
 inline void wxOleUninitialize()
 {
-#ifdef __WXWINCE__
-    ::CoUninitialize();
-#else
     ::OleUninitialize();
-#endif
 }
 
 // ----------------------------------------------------------------------------