Bug 40069: Fix encoding of stdout and stderr

Set stdout and stder encoding based on nl_langinfo, or LC_ALL and LANG
locale environment variables, as suggested on
https://perldoc.perl.org/open.

rbm

 #!/usr/bin/perl -w
 
 use strict;
+use open OUT => ':locale';
 use File::Basename;
 use lib dirname($0) . '/lib';
 use RBM;