GCC 3.2 is really picky about friends & dllexport.

Now wxWindows compiles (again) as DLL with MinGW GCC 3.2


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17320 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/object.h

@@ -501,7 +501,7 @@ protected:
 
 class WXDLLEXPORT wxObjectRefData
 {
-    friend class wxObject;
+    friend class WXDLLEXPORT wxObject;
 
 public:
     wxObjectRefData() : m_count(1) { }