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/os2/pen.h

@@ -17,11 +17,11 @@
 
 typedef long wxPMDash;
 
-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& rData);