[Perl/perl5] 42a1fd: Revert "open: only treat literal undef as special"

[Aristotle Pagaltzis via perl5-changes]

  Branch: refs/heads/ap/open-undef
  Home:   https://github.com/Perl/perl5
  Commit: 42a1fdcb1d985c3102d747a6f383ec3d78fefa78
      
https://github.com/Perl/perl5/commit/42a1fdcb1d985c3102d747a6f383ec3d78fefa78
  Author: Aristotle Pagaltzis <pagalt...@gmx.de>
  Date:   2025-05-23 (Fri, 23 May 2025)

  Changed paths:
    M doio.c
    M op.c
    M op.h
    M pod/perldelta.pod
    M t/io/perlio_open.t

  Log Message:
  -----------
  Revert "open: only treat literal undef as special"

This reverts commit 471c834070f1d22c4f2dc1c9997a5adfd959f3e5 but also
adds a test which the reverted code would not pass and a perldelta item.



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