core-updates failing packages

[Leo Famulari]

The armhf port is currently blocked while we try to build Guile 2.2.2,
so I'm focusing on x86_64-linux for now.

Here is a list of failing packages on x86_64-linux that need some help:

gnome-mime-data fails due to a regex parsing issue that was exposed by
the update to Perl 5.26.0:
https://hydra.gnu.org/build/2170234

go-1.8 fails due to the same regex parsing issue:
https://hydra.gnu.org/build/2168634

gengetopt fails:
https://hydra.gnu.org/build/2169271

guile-bash fails:
https://hydra.gnu.org/build/2171039

ngs-sdk fails due to the Perl 5.26.0 change to a "dotless INC":
https://hydra.gnu.org/build/2171274

metabat fails:
https://hydra.gnu.org/build/2171756

perl-class-accessor-grouped fails due to dotless INC (patch available on
upstream bug tracker):
https://hydra.gnu.org/build/2170942

perl-http-parser-xz fails due to dotless INC:
https://hydra.gnu.org/build/2172752

perl-object-signature fails due to dotless INC (patch available on
upstream bug tracker):
https://hydra.gnu.org/build/2172672

perl-test-script fails due to dotless INC:
https://hydra.gnu.org/build/2174900

perl-unicode-normalize fails due to dotless INC:
https://hydra.gnu.org/build/2171416

perl-www-curl fails due to dotless INC:
https://hydra.gnu.org/build/2174250

perl-xs-object-magic fails due to dotless INC:
https://hydra.gnu.org/build/2170768

python2-pexpect fails:
https://hydra.gnu.org/build/2168957

quilt fails due to that Perl 5.26.0 regex parsing issue:
https://hydra.gnu.org/build/2169903

zsh fails its tests. I've noticed this test suite is unreliable:
https://hydra.gnu.org/build/2170357

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