[Perl/perl5] afe3e6: allow some basic infrastructure to load with -Duse...

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: afe3e67fb0863443a08b1e2f0d9aada21c79a279
      
https://github.com/Perl/perl5/commit/afe3e67fb0863443a08b1e2f0d9aada21c79a279
  Author: Tony Cook <t...@develop-help.com>
  Date:   2024-01-04 (Thu, 04 Jan 2024)

  Changed paths:
    M TestInit.pm
    M regen/embed_lib.pl
    M t/test.pl

  Log Message:
  -----------
  allow some basic infrastructure to load with -Dusedefaultstrict

The changes to t/test.pl appear to be real bugs.

This allows `make test_harness` to run, but many tests will still
fail under -Dusedefaultstrict

This addresses #21732 but does not fix it.  I'm unsure how
supported that build option is.