[Perl/perl5] 320f4b: Sync DB_File with CPAN version 1.856

[Paul Marquess via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 320f4ba29003e664eedac8106735d0958c8328dd
      
https://github.com/Perl/perl5/commit/320f4ba29003e664eedac8106735d0958c8328dd
  Author: Paul Marquess <p...@cpan.org>
  Date:   2021-07-17 (Sat, 17 Jul 2021)

  Changed paths:
    M Porting/Maintainers.pl
    M cpan/DB_File/DB_File.pm
    M cpan/DB_File/DB_File.xs
    M cpan/DB_File/Makefile.PL
    M cpan/DB_File/dbinfo
    M cpan/DB_File/typemap

  Log Message:
  -----------
  Sync DB_File with CPAN version 1.856

>From Changes:

1.856 22 June 2021

   * Ensure that all *.bak files are cleaned up
     https://github.com/pmqs/DB_File/pull/9
     96bcf494625897ab4fcda322481dd6f730bdb668