bug#40826: core-updates: guile: warning: failed to install locale

[sirgazil]

I'm using the GNU system distributed by Guix.


## Steps to reproduce

1. guix pull --branch=core-updates
2. guix --version (or any other guix command)


## Expected result

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$ guix --version
guix (GNU Guix) 4affa9182d93c77505c40e95964b8ab9d436298b
Copyright (C) 2020 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
★★★★★★★★★★★★★★★★★★★★


## Unexpected result

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$ guix --version
guile: warning: failed to install locale
hint: Consider installing the `glibc-utf8-locales' or `glibc-locales' package 
and
defining `GUIX_LOCPATH', along these lines:

     guix package -i glibc-utf8-locales
     export GUIX_LOCPATH="$HOME/.guix-profile/lib/locale"

See the "Application Setup" section in the manual, for more info.

guix (GNU Guix) 4affa9182d93c77505c40e95964b8ab9d436298b
Copyright (C) 2020 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law
★★★★★★★★★★★★★★★★★★★★

This warning is confusing because I'm using the GNU system. The "Application 
Setup" section, as far as I understand, is for Guix on foreign distros.


## System information

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$ LANG=C guix describe
Generation 75   Apr 24 2020 12:03:48    (current)
  guix 4affa91
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: core-updates
    commit: 4affa9182d93c77505c40e95964b8ab9d436298b
  sirgazil-x 5ef0404
    repository URL: https://gitlab.com/sirgazil/guix-channel-x.git
    branch: master
    commit: 5ef04045d14e154e7792b42762155be63cf34076
★★★★★★★★★★★★★★★★★★★★



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