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/platform.h

@@ -118,59 +118,6 @@
 
 #endif /* __WXGTK__ && __WINDOWS__ */
 
-/* detect MS SmartPhone */
-#if defined( WIN32_PLATFORM_WFSP )
-#   ifndef __SMARTPHONE__
-#       define __SMARTPHONE__
-#   endif
-#   ifndef __WXWINCE__
-#       define __WXWINCE__
-#   endif
-#endif
-
-/* detect PocketPC */
-#if defined( WIN32_PLATFORM_PSPC )
-#   ifndef __POCKETPC__
-#       define __POCKETPC__
-#   endif
-#   ifndef __WXWINCE__
-#       define __WXWINCE__
-#   endif
-#endif
-
-/* detect Standard WinCE SDK */
-#if defined( WCE_PLATFORM_STANDARDSDK )
-#   ifndef __WINCE_STANDARDSDK__
-#       define __WINCE_STANDARDSDK__
-#   endif
-#   ifndef __WXWINCE__
-#       define __WXWINCE__
-#   endif
-#endif
-
-#if defined(_WIN32_WCE) && !defined(WIN32_PLATFORM_WFSP) && !defined(WIN32_PLATFORM_PSPC)
-#   if (_WIN32_WCE >= 400)
-#       ifndef __WINCE_NET__
-#           define __WINCE_NET__
-#       endif
-#   elif (_WIN32_WCE >= 200)
-#       ifndef __HANDHELDPC__
-#           define __HANDHELDPC__
-#       endif
-#   endif
-#   ifndef __WXWINCE__
-#       define __WXWINCE__
-#   endif
-#endif
-
-#if defined(__WXWINCE__) && defined(_MSC_VER) && (_MSC_VER == 1201)
-    #define __EVC4__
-#endif
-
-#if defined(__POCKETPC__) || defined(__SMARTPHONE__) || defined(__WXGPE__)
-#   define __WXHANDHELD__
-#endif
-
 #ifdef __ANDROID__
 #   define __WXANDROID__
 #   include "wx/android/config_android.h"
@@ -408,9 +355,7 @@
 #endif
 
 /* Force linking against required libraries under Windows: */
-#ifdef __WXWINCE__
-#   include "wx/msw/wince/libraries.h"
-#elif defined __WINDOWS__
+#if defined __WINDOWS__
 #   include "wx/msw/libraries.h"
 #endif