make the Pen/Brush code backward compatible as discussed on wx-dev; marked the blocks of code to deprecate in future with FUTURE_WXWIN_COMPATIBILITY_3_0; add wxCHECK_MSG in all ports to block Get*() calls on invalid objects (as already is for all other refcounted objects and for most ports)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52636 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/brush.h

@@ -23,6 +23,9 @@ public:
     wxBrush() { }
 
     wxBrush( const wxColour &colour, wxBrushStyle style = wxBRUSHSTYLE_SOLID );
+#if FUTURE_WXWIN_COMPATIBILITY_3_0
+    wxDEPRECATED_FUTURE( wxBrush(const wxColour& col, int style) );
+#endif
     wxBrush( const wxBitmap &stippleBitmap );
     virtual ~wxBrush();