Configure update.

Configure update.
Sequent DYNIX/ptx updates: osvers=$4 (instead of $3) of uname -a,

	From: Andy Dougherty <doughera@lafcol.lafayette.edu>
	To: Martin Bligh <mbligh@sequent.com>
	Cc: Jarkko Hietaniemi <jhi@iki.fi>
	Subject: Re: Perl 5's configure on DYNIX/ptx
	Message-Id: <Pine.SUN.3.96.981103090824.5533B-100000@newton.phys>
	Date: Tue, 3 Nov 1998 09:35:26 -0500 (EST)

find sockets also from libsocket, not just libnet.
OS390: $compile_ok instead of $compile for <inttypes.h>,

	From: pvhp@forte.com (Peter Prymmer)
	To: Thomas.Dorner@start.de, jhi@iki.fi, neale@VMA.TABNSW.COM.AU
	Subject: _53 not OK on os390 but looking better than ever
	Date: Tue, 3 Nov 98 17:33:22 PST
	Message-Id: <9811040133.AA09450@forte.com>

p4raw-id: //depot/cfgperl@2190