[gtkada] [compiling] Problem with misc_extra.c when compiling GtkAda 2.2.x( with GtK2.4)

[Arnaud Charlet]

>     Uau! :-) I agree helping in the port of GtkAda to version 2.4.x :-) 

Great. Note that it is probably not as hard as it sounds, and may not require
much Gtk+ 2.4 knowledge.

My guess is that some private fields were used by gtkextra, rather than
using public accessor functions. If that's the case, the change would be to
use these accessor functions.

Arno