Use perl warnings pragma consistently

We've had a mixture of the warnings pragma, the -w switch on the shebang
line, and no warnings at all. This patch removes the -w swicth and add
the warnings pragma to all perl sources missing it. It raises the
severity of the TestingAndDebugging::RequireUseWarnings  perlcritic
policy to level 5, so that we catch any future violations.

Discussion: https://postgr.es/m/[email protected]

1 files changed, 1 insertions, 0 deletions

diff --git a/src/test/locale/sort-test.pl b/src/test/locale/sort-test.pl
index b8fc93aab18..b61968b7e0a 100755
--- a/src/test/locale/sort-test.pl
+++ b/src/test/locale/sort-test.pl
@@ -1,6 +1,7 @@
 #! /usr/bin/perl
 
 use strict;
+use warnings;
 use locale;
 
 open(my $in_fh, '<', $ARGV[0]) || die;