dll compilation fix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22051 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/list.h

@@ -226,7 +226,7 @@ enum wxKeyType
 
 // due to circular header dependencies this function has to be declared here
 // (normally it's found in utils.h which includes itself list.h...)
-extern WXDLLEXPORT wxChar* copystring(const wxChar *s);
+extern WXDLLIMPEXP_BASE wxChar* copystring(const wxChar *s);
 
 class WXDLLEXPORT wxObjectListNode;
 typedef wxObjectListNode wxNode;