core-updates freeze

[Marius Bakke]

Guix,

The core-updates branch is now (almost!) ready for prime time.

This is turning out to be one of the biggest merges ever[*], currently
representing 433 commits from 15 people, with commits dating back to
September last year(!).

Some of the highlights from this branch include:

* jannekes long-awaited new reduced binary seeds for i686 and x86_64
* GCC7 is now the default compiler
* The 'CMake' package comes with full documentation
* OpenSSL 1.1 is now the default 'openssl' package
* GNOME 3.30
* glibc 2.29, binutils 2.32, gettext 0.20, bash 5.0.7, gawk 5.0.1, ...

To give everyone a little time to brush up any last-minute patches, as
well as let the CI catch up with 'master' and 'staging', I suggest we
set a final date for starting the full CI build on *July 9th*, i.e six
days from now.  At which point the branch becomes bugfix-only, no new
updates or features.

July 9th incidentally gives us just enough time to get Python 3.7.4 too,
which comes with desirable security and OpenSSL 1.1 compatibility fixes.

Thoughts?

[*] counting only merges to 'master'

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