[Perl/perl5] f03835: Fix definition of ITEM_NOT_FOUND for pre-1.13 vers...

[Sergey Poznyakoff via perl5-changes]

  Branch: refs/heads/smoke-me/jkeenan/gh-19482-maint-5.34-gdbm-problem-20220303
  Home:   https://github.com/Perl/perl5
  Commit: f03835b2aba5276eac15b30196893d0f9926821e
      
https://github.com/Perl/perl5/commit/f03835b2aba5276eac15b30196893d0f9926821e
  Author: Sergey Poznyakoff <g...@gnu.org>
  Date:   2022-03-04 (Fri, 04 Mar 2022)

  Changed paths:
    M ext/GDBM_File/GDBM_File.xs

  Log Message:
  -----------
  Fix definition of ITEM_NOT_FOUND for pre-1.13 versions.

Signed-off-by: James E Keenan <jkee...@cpan.org>