core-updates frozen!

[Marius Bakke]

Hello Guix!

The 'core-updates' branch is now in a "feature freeze" after a long ...
thawing period.  That means that there will be no more world rebuilding
changes apart from bug fixes[*].

It is expected to start the full rebuild in a few days once the
bootstrap is complete on AArch64 and ARMv7, which are unfortunately
lacking in compute power at the moment (side note: if you have hardware
to spare, consider donating!).

The branch currently represents 676 commits by 26 people.  Some
highlights from this round:

* Guix runs natively on GNU/Hurd.
* Guix System can be cross-compiled for foreign architectures.
* The distribution is built with Guile 3.0.
* GNOME 3.34 (on a separate branch, will get merged shortly).

Significant package updates:

* glibc 2.31
* Python 3.8.2
* Ruby 2.6.5
* TeX Live 2019

Other changes that may require adjusting third-party channels:

* "libjpeg" has been deprecated in favor of "libjpeg-turbo".
* "util-linux" gained a "lib" output for significant size savings.
* Build systems now set C_INCLUDE_PATH and CPLUS_INCLUDE_PATH instead of
  CPATH.
* Any package that uses libcurl now respects SSL_CERT_DIR and
  SSL_CERT_FILE.

Thanks to everyone who contributed to this branch.  Let the rebuilds
begin!

[*] There are problems with OpenSSL 1.1.1e and we might take on 1.1.1f
if it is released before the full rebuild starts:
https://mta.openssl.org/pipermail/openssl-project/2020-March/001919.html

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