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/datetime.cpp

@@ -81,9 +81,7 @@
 
 #ifdef __WINDOWS__
     #include <winnls.h>
-    #ifndef __WXWINCE__
-        #include <locale.h>
-    #endif
+    #include <locale.h>
 #endif
 
 #include "wx/datetime.h"
@@ -800,7 +798,6 @@ void wxDateTime::GetAmPmStrings(wxString *am, wxString *pm)
 wxDateTime::Country wxDateTime::GetCountry()
 {
     // TODO use LOCALE_ICOUNTRY setting under Win32
-#ifndef __WXWINCE__
     if ( ms_country == Country_Unknown )
     {
         // try to guess from the time zone name
@@ -835,9 +832,6 @@ wxDateTime::Country wxDateTime::GetCountry()
             ms_country = USA;
         }
     }
-#else // __WXWINCE__
-     ms_country = USA;
-#endif // !__WXWINCE__/__WXWINCE__
 
     return ms_country;
 }