[gtkada] .../examples/doublebuffer/anim_task.adb needs Gtk.Threads.G_Init

[T. Kurt Bond]

The tasking animation example in
GtkAda-2.2.0/examples/doublebuffer/anim_task.adb needs to call
Gtk.Threads.G_Init before Gtk.Threads.Init is called, or the program
will abort with the message:

    Gdk-ERROR **: g_thread_init() must be called before gdk_threads_init()
    aborting...

I tried this under Windows 2000 and FreeBSD 4.8, but I imagine it
would happen elsewhere as well.

Here's a patch:
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T. Kurt Bond, tkb at tkb.mpl.com