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/app.h

@@ -116,25 +116,5 @@ protected:
     wxDECLARE_DYNAMIC_CLASS(wxApp);
 };
 
-#ifdef __WXWINCE__
-
-// under CE provide a dummy implementation of GetComCtl32Version() returning
-// the value passing all ">= 470" tests (which are the only ones used in our
-// code currently) as commctrl.dll under CE 2.0 and later support comctl32.dll
-// functionality
-inline int wxApp::GetComCtl32Version()
-{
-    return 471;
-}
-
-// this is not currently used at all under CE so it's not really clear what do
-// we need to return from here
-inline int wxApp::GetShell32Version()
-{
-    return 0;
-}
-
-#endif // __WXWINCE__
-
 #endif // _WX_APP_H_