integrate changes#2254,2259,2335,2345,2348,2361,2368,2380 from mainline

integrate changes#2254,2259,2335,2345,2348,2361,2368,2380 from mainline

win32_recvfrom() compatibility fix

From: "Kurt D. Starsinic" <kstar@chapin.edu>
Subject: Re: [PATCH] Re: pod2man bug in date generated line
To: Albert Dvornik <bert@genscan.com>, "Larry W. Virden" <lvirden@cas.org>
Cc: perlbug@perl.com
Date: 20 Nov 1998 21:30:17 +0200
Message-ID: <MLIST_19981120131523.A464@O2.chapin.edu>

make $1 et al readonly under threads; make C<undef $1> fail like
C<$1 = undef> does

fix typo in pp_defined() causing C<defined %tied> to fail

more conservative version of changes#2345,2346,2347; those break
C<defined(@{"foo::ISA"})> which seems to be extensively used in
the libs :-(

fix uninitialized warnings
	From: Brian Callaghan <callagh@itginc.com>
	Date: Thu, 19 Nov 1998 17:49:10 -0800
	Message-Id: <3654CA96.B64FCAEB@itginc.com>
	Subject: Complete.pm patch (version 1.1)

Liblist tweak suggested by Swen Thuemmler <Swen.Thuemmler@paderlinx.de>;
add C<$Config{installarchlib}/CORE> to the default locations searched
on win32

prefer IO::Handle for IO if FileHandle:: is empty (as suggested by
Tim Bunce)

p4raw-link: @2348 on //depot/perl: 6051dbdb749e970695dd861ca273edafbbb539cb
p4raw-link: @2347 on //depot/perl: bbc8e6a4a34cbf904dc23fa18f4e503924aea3f8
p4raw-link: @2346 on //depot/perl: 659eaf7385567ca82dd230a62d6a7f51364f0d0a
p4raw-link: @2345 on //depot/perl: 6b377df57679ab68ed17b736ebee0458acb25b21
p4raw-link: @2335 on //depot/perl: a3f914c54a06647534c0855205d45eb950aebdd4
p4raw-link: @2259 on //depot/cfgperl: 10d20342241794db0c535c2739c380f367a9f178
p4raw-link: @2254 on //depot/perl: e4449fe1872a24e805fcc129361ea26a406317d8

p4raw-id: //depot/maint-5.005/perl@2398
p4raw-integrated: from //depot/perl@2335 'copy in' t/op/undef.t
	(@1575..)
p4raw-integrated: from //depot/perl@2315 'copy in' win32/win32sck.c
	(@1612..) lib/ExtUtils/Liblist.pm pod/perlfaq4.pod (@1760..)
	pod/pod2man.PL (@1922..) lib/Term/Complete.pm (@2003..)