[gtkada] GtkAda-2.4.0

[Sunriis]

> Apparently the version of mingw import libraries that come with GNAT 3.15p
> is too old and does not include the definition of SetCursorPos.
> 
> I would suggest using either an update import library for the Windows libraries,
> or updating to a newer version of GNAT.
> 
> We will see if this reference can be removed from GtkAda to avoid this
> problem.
> 
> Arno

I had the same problem: how can I update mingw? Wich packages do I
need to download? Where do I have to extract them? Do I have to make
any change to paths or stuff like that?

Would it be easier to update to a newer version of GNAT and if so
where could I find it?