[PATCH 1/6] index: use v5.12, remove outdated comment

[Eric Wong <e@80x24.org>]

There's no unicode_strings-dependent code in this script, so
v5.12 is safe.  The comment about libeatmydata shouldn't be
necessary for -index any longer since we support --no-fsync
nowadays and Xapian 1.4+ is fairly widespread.
---
 script/public-inbox-index | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/script/public-inbox-index b/script/public-inbox-index
index a13e44bf..82baa7b4 100755
--- a/script/public-inbox-index
+++ b/script/public-inbox-index
@@ -1,12 +1,9 @@
 #!perl -w
-# Copyright (C) 2015-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 # Basic tool to create a Xapian search index for a public-inbox.
-# Usage with libeatmydata <https://www.flamingspork.com/projects/libeatmydata/>
-# highly recommended: eatmydata public-inbox-index INBOX_DIR
 
-use strict;
-use v5.10.1;
+use v5.12;
 use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
 my $help = <<EOF; # the following should fit w/o scrolling in 80x24 term:
 usage: public-inbox-index [options] INBOX_DIR