[Perl/perl5] d9c8bd: Make PerlIO::get_layers accept IO references

[Leon Timmermans via perl5-changes]

  Branch: refs/heads/leont/getlayers-io
  Home:   https://github.com/Perl/perl5
  Commit: d9c8bd32cc8da8126e3cb424a2479f04d030385c
      
https://github.com/Perl/perl5/commit/d9c8bd32cc8da8126e3cb424a2479f04d030385c
  Author: Leon Timmermans <faw...@gmail.com>
  Date:   2022-08-08 (Mon, 08 Aug 2022)

  Changed paths:
    M pod/perldelta.pod
    M t/io/layers.t
    M universal.c

  Log Message:
  -----------
  Make PerlIO::get_layers accept IO references