[gtkmm] additions to the gtkmm PORTING guide

[Manuel Clos <llanero eresmas net>]

Hi all,

I noticed that the PORTING file does not mention smart pointers. At the 
moment I have only founde the Gdk::Window class.

* Classes that use smart pointers:
* Change Gdk_Window to Glib::RefPtr<Gdk::Window> and use "->" instead of "."
* See http://gtkmm.sourceforge.net/gtkmm2/tutorial/html/ch16s02.html for 
more info.

--
Manuel Clos
llanero eresmas net

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