fixed gcc warnings about not calling base class ctor explicitly in copy ctors (patch 1028986)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29170 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/pen.h

@@ -81,7 +81,7 @@ public:
     wxPen();
     wxPen(const wxColour& col, int width = 1, int style = wxSOLID);
     wxPen(const wxBitmap& stipple, int width);
-    wxPen(const wxPen& pen) { Ref(pen); }
+    wxPen(const wxPen& pen) : wxGDIObject(pen) { Ref(pen); }
     virtual ~wxPen();
 
     wxPen& operator=(const wxPen& pen)