Require Perl 5.26.0

Our platform support policy states that we require "versions of
dependencies which are generally accepted as stable and supportable,
e.g., in line with the version used by other long-term-support
distributions".  Of Debian, Ubuntu, RHEL, and SLES, the four most common
distributions that provide LTS versions, the version with mainstream
long-term security support with the oldest Perl is 5.26.0 in SLES 15.6.

This is a major upgrade, since Perl 5.8.1, according to the Perl
documentation, was released in September of 2003.  It brings a lot of
new features that we can choose to use, such as s///r to return the
modified string, the postderef functionality, and subroutine signatures,
although the latter was still considered experimental until 5.36.

This change was made with the following one-liner, which intentionally
excludes modifying the vendored modules we include to avoid conflicts:

    git grep -l 'use 5.008001' | grep -v 'LoadCPAN/' | xargs perl -pi -e 's/use 5.008001/require v5.26/'

Use require instead of use to avoid changing the behavior as the latter
enables features and the former does not.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>

INSTALL

@@ -119,7 +119,7 @@ Issues of note:
 	- A POSIX-compliant shell is required to run some scripts needed
 	  for everyday use (e.g. "bisect", "request-pull").
 
-	- "Perl" version 5.8.1 or later is needed to use some of the
+	- "Perl" version 5.26.0 or later is needed to use some of the
 	  features (e.g. sending patches using "git send-email",
 	  interacting with svn repositories with "git svn").  If you can
 	  live without these, use NO_PERL.  Note that recent releases of

contrib/diff-highlight/DiffHighlight.pm

@@ -1,6 +1,6 @@
 package DiffHighlight;
 
-use 5.008001;
+require v5.26;
 use warnings FATAL => 'all';
 use strict;
 

contrib/mw-to-git/Git/Mediawiki.pm

@@ -1,6 +1,6 @@
 package Git::Mediawiki;
 
-use 5.008001;
+require v5.26;
 use strict;
 use POSIX;
 use Git;

git-archimport.perl

@@ -54,7 +54,7 @@ and can contain multiple, unrelated branches.
 
 =cut
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 use Getopt::Std;

git-cvsexportcommit.perl

@@ -1,6 +1,6 @@
 #!/usr/bin/perl
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 use Getopt::Std;

git-cvsimport.perl

@@ -13,7 +13,7 @@
 # The head revision is on branch "origin" by default.
 # You can change that with the '-o' option.
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 use Getopt::Long;

git-cvsserver.perl

@@ -15,7 +15,7 @@
 ####
 ####
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 use bytes;

git-send-email.perl

@@ -16,7 +16,7 @@
 #    and second line is the subject of the message.
 #
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 use Getopt::Long;

git-svn.perl

@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 # Copyright (C) 2006, Eric Wong <normalperson@yhbt.net>
 # License: GPL v2 or later
-use 5.008001;
+require v5.26;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 use strict;
 use vars qw/	$AUTHOR $VERSION

gitweb/gitweb.perl

@@ -7,7 +7,7 @@
 #
 # This program is licensed under the GPLv2
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 # handle ACL in file access tests

perl/Git.pm

@@ -7,7 +7,7 @@ Git - Perl interface to the Git version control system
 
 package Git;
 
-use 5.008001;
+require v5.26;
 use strict;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 

perl/Git/I18N.pm

@@ -1,5 +1,5 @@
 package Git::I18N;
-use 5.008001;
+require v5.26;
 use strict;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 BEGIN {

perl/Git/LoadCPAN.pm

@@ -1,5 +1,5 @@
 package Git::LoadCPAN;
-use 5.008001;
+require v5.26;
 use strict;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 

perl/Git/Packet.pm

@@ -1,5 +1,5 @@
 package Git::Packet;
-use 5.008001;
+require v5.26;
 use strict;
 use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
 BEGIN {

t/t0202/test.pl

@@ -1,5 +1,5 @@
 #!/usr/bin/perl
-use 5.008001;
+require v5.26;
 use lib (split(/:/, $ENV{GITPERLLIB}));
 use strict;
 use warnings;

t/t5562/invoke-with-content-length.pl

@@ -1,4 +1,4 @@
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 

t/t9700/test.pl

@@ -1,7 +1,7 @@
 #!/usr/bin/perl
 use lib (split(/:/, $ENV{GITPERLLIB}));
 
-use 5.008001;
+require v5.26;
 use warnings;
 use strict;
 

t/test-terminal.perl

@@ -1,5 +1,5 @@
 #!/usr/bin/perl
-use 5.008001;
+require v5.26;
 use strict;
 use warnings;
 use IO::Pty;