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/common/log.cpp

@@ -46,17 +46,11 @@
 #include "wx/vector.h"
 
 // other standard headers
-#ifndef __WXWINCE__
 #include <errno.h>
-#endif
 
 #include <stdlib.h>
 
-#ifndef __WXWINCE__
 #include <time.h>
-#else
-#include "wx/msw/wince/time.h"
-#endif
 
 #if defined(__WINDOWS__)
     #include "wx/msw/private.h" // includes windows.h
@@ -1092,7 +1086,6 @@ const wxChar *wxSysErrorMsg(unsigned long nErrCode)
 
     // copy it to our buffer and free memory
     // Crashes on SmartPhone (FIXME)
-#if !defined(__SMARTPHONE__) /* of WinCE */
     if( lpMsgBuf != 0 )
     {
         wxStrlcpy(s_szBuf, (const wxChar *)lpMsgBuf, WXSIZEOF(s_szBuf));
@@ -1109,7 +1102,6 @@ const wxChar *wxSysErrorMsg(unsigned long nErrCode)
         }
     }
     else
-#endif // !__SMARTPHONE__
     {
         s_szBuf[0] = wxS('\0');
     }