bug in gtkwindow.c in 0.99.7

[<ph sxb bsf alcatel fr> (Pierre HANSER)]

hello

in gtk_window_configuration_event, window should be initialised
before being used, in the very beginning of the procedure.

[was found on sparc Solaris with afterstep, trying to execute testgtk
which core dump without correction]

	pierre

sorry if this was already known

--------------------------------------------------------------------
Pierre HANSER                                        Alcatel Telecom
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 Email:  Pierre.Hanser@sxb.bsf.alcatel.fr