AIX compilation fixes from Paul Thiessen

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14233 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dir.h

@@ -67,6 +67,8 @@ public:
 // wxDir: portable equivalent of {open/read/close}dir functions
 // ----------------------------------------------------------------------------
 
+class WXDLLEXPORT wxDirData;
+
 class WXDLLEXPORT wxDir
 {
 public:

include/wx/list.h

@@ -131,6 +131,8 @@ private:
 
 WXDLLEXPORT_DATA(extern wxListKey) wxDefaultListKey;
 
+class WXDLLEXPORT wxListBase;
+
 class WXDLLEXPORT wxNodeBase
 {
 friend class wxListBase;

include/wx/popupwin.h

@@ -68,6 +68,9 @@ public:
 // when the user clicks mouse outside it or if it loses focus in any other way
 // ----------------------------------------------------------------------------
 
+class WXDLLEXPORT wxPopupWindowHandler;
+class WXDLLEXPORT wxPopupFocusHandler;
+
 class WXDLLEXPORT wxPopupTransientWindow : public wxPopupWindow
 {
 public: