[Perl/perl5] c0a1a3: Add an EXISTS method to NDBM_File

[Leon Timmermans via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: c0a1a377c02ed789f5eff667f46a2314a05c5a4c
      
https://github.com/Perl/perl5/commit/c0a1a377c02ed789f5eff667f46a2314a05c5a4c
  Author: Leon Timmermans <faw...@gmail.com>
  Date:   2022-07-29 (Fri, 29 Jul 2022)

  Changed paths:
    M ext/NDBM_File/NDBM_File.pm
    M ext/NDBM_File/NDBM_File.xs
    M t/lib/dbmt_common.pl

  Log Message:
  -----------
  Add an EXISTS method to NDBM_File