[core-updates] issues with python's zip

[Brian Cully via "Development of GNU Guix and the GNU System distribution." <guix-devel@gnu.org>]

I've run into issues with two packages on core-updates that fail 
to build because the zip library being used can't handle dates 
before 1980. I assume there are more.

Do we have a way to handle this gracefully? In the mean time I've 
patched both packages (‘sssd’ and ‘criu’) with a new build phase:

--8<---------------cut here---------------start------------->8---
          (add-before 'install 'change-file-datetimes
            (lambda _
              (use-modules (ice-9 ftw))
              (let ((dir ".")
                    (time 315532800)) ; 00:00:00 1-jan-1980 UTC
                (let loop ((prefix "")
                           (node (file-system-tree (pk ".:" 
                           dir))))
                  ;; unqualified use of ‘match’ leads to a syntax 
                  error when
                  ;; using ‘...’, so specify the module 
                  explicitly.
                  ((@ (ice-9 match) match) node
                   ((name stat) ; flat file
                    (when (not (eq? (stat:type stat) 'symlink))
                      (utime (string-append prefix name) time 
                      time)))
                   ((name stat children ...) ; directory
                    (utime (string-append prefix name) time time)
                    (for-each (lambda (child)
                                (loop (string-append prefix name
                                                     file-name-separator-string)
                                      child))
                              children)))))))
--8<---------------cut here---------------end--------------->8---

With this, the only outstanding issue with core-updates is #62820, 
which I'm baffled by. It appears to me as though the substitute is 
issuing up a broken ‘rules’ file, but since this is used by the 
keymap in ‘operating-system’, I would imagine a lot of people 
would have hit this bug, so why seemingly just me?

-bjc