libstring-diff-perl: FTBFS: test failures with new libyaml-perl

[gregoa]

We have the following bug reported to the Debian package of
String-Diff (https://bugs.debian.org/849362):

It doesn't seem to be a bug in the packaging, so you may want to take
a look. Thanks!

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Package: libstring-diff-perl
Version: 0.07-1
Severity: serious
User: debian-perl@lists.debian.org
Usertags: autopkgtest

As noticed by ci.debian.net, this package fails its test suite
on current sid, making it fail to build from source.

This regressed with libyaml-perl_1.21-1.

  https://ci.debian.net/packages/libs/libstring-diff-perl/unstable/amd64/

  #   Failed test at t/02_diff_fully-pp.t line 16.
  #     Structures begin differing at:
  #          $got->[1] = undef
  #     $expected->[1] = ARRAY(0x557f6be5d7a8)
  # Looks like you failed 1 test of 13.
  
  Test Summary Report
  -------------------
  t/02_diff_fully-pp.t  (Wstat: 256 Tests: 13 Failed: 1)
    Failed test:  2
    Non-zero exit status: 1
  t/02_diff_fully.t     (Wstat: 256 Tests: 13 Failed: 1)
    Failed test:  2
    Non-zero exit status: 1
 
-- 
Niko Tyni   ntyni@debian.org

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Thanks for considering,
gregor herrmann,
Debian Perl Group

[gregoa]

@ntyni provided a patch in the debian bug tracker: https://bugs.debian.org/849362#12

[nieder]

See #7 and #8