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/brush.h

@@ -32,7 +32,7 @@ public:
     wxBrush();
     wxBrush(const wxColour& col, int style = wxSOLID);
     wxBrush(const wxBitmap& stipple);
-    wxBrush(const wxBrush& brush) { Ref(brush); }
+    wxBrush(const wxBrush& brush) : wxGDIObject(brush) { Ref(brush); }
     virtual ~wxBrush();
 
     virtual void SetColour(const wxColour& col);