added WXDLLIMPEXP_FWD_FOO macros in addition to WXDLLIMPEXP_FOO for use with forward declarations (in preparation for GCC visibility support)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47254 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/pen.h

@@ -16,11 +16,11 @@
 #include "wx/colour.h"
 #include "wx/bitmap.h"
 
-class WXDLLEXPORT wxPen;
+class WXDLLIMPEXP_FWD_CORE wxPen;
 
 class WXDLLEXPORT wxPenRefData: public wxGDIRefData
 {
-    friend class WXDLLEXPORT wxPen;
+    friend class WXDLLIMPEXP_FWD_CORE wxPen;
 public:
     wxPenRefData();
     wxPenRefData(const wxPenRefData& data);