backported wxXmlNode::InsertChildAfter and its use during XML parsing to 2.8

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@52976 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/xml/xml.h

@@ -116,6 +116,9 @@ public:
               const wxString& content = wxEmptyString);
     virtual void AddChild(wxXmlNode *child);
     virtual bool InsertChild(wxXmlNode *child, wxXmlNode *followingNode);
+#if wxABI_VERSION >= 20808
+    bool InsertChildAfter(wxXmlNode *child, wxXmlNode *precedingNode);
+#endif
     virtual bool RemoveChild(wxXmlNode *child);
     virtual void AddProperty(const wxString& name, const wxString& value);
     virtual bool DeleteProperty(const wxString& name);