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/filename.h

@@ -395,7 +395,7 @@ public:
         return !m_dontFollowLinks;
     }
 
-#if defined(__WIN32__) && !defined(__WXWINCE__) && wxUSE_OLE
+#if defined(__WIN32__) && wxUSE_OLE
         // if the path is a shortcut, return the target and optionally,
         // the arguments
     bool GetShortcutTarget(const wxString& shortcutPath,
@@ -403,7 +403,6 @@ public:
                            wxString* arguments = NULL) const;
 #endif
 
-#ifndef __WXWINCE__
         // if the path contains the value of the environment variable named envname
         // then this function replaces it with the string obtained from
         //    wxString::Format(replacementFmtString, value_of_envname_variable)
@@ -415,7 +414,6 @@ public:
     bool ReplaceEnvVariable(const wxString& envname,
                             const wxString& replacementFmtString = "$%s",
                             wxPathFormat format = wxPATH_NATIVE);
-#endif
 
         // replaces, if present in the path, the home directory for the given user
         // (see wxGetHomeDir) with a tilde