bug#41063: emacs-guix: unrecognized keyword error

[Christopher Howard]

If I attempt to install a package in emacs-guix, process dies with
error

'''
scheme@(emacs-guix)> (process-package-actions "/var/guix/profiles/per-
user/christopher/guix-profile" #:install '((139934396296288 "out"))
#:upgrade '() #:remove '() #:use-substitutes? #t #:dry-run? #f)
The process begins ...
The following package will be installed:
   pioneers 15.5

emacs-guix/actions.scm:118:8: In procedure process-package-actions:
Unrecognized keyword: #:use-substitutes?

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(emacs-guix) [1]> ,bt
In emacs-guix/actions.scm:
    118:8  0 (process-package-actions _ #:install _ #:upgrade _
#:remove _ #:use-substitutes? _ #:dry-run? _)
'''

I have attempted running the same command in the shell, remiving the
#:use-substitutes flag, but mysteriously get the same error.

System info:

christopher@nightshade ~$ guix describe
Generation 20   Apr 30 2020 05:34:14    (current)
  guix f03e5ca
    repository URL: https://git.savannah.gnu.org/git/guix.git
    commit: f03e5ca59f2f099693def2c8e6ff409e5b4ed40a
christopher@nightshade ~$ neofetch 
christopher@nightshade 
---------------------- 
OS: Guix System f03e5ca59f2f099693def2c8e6ff409e5b4ed40a x86_64 
Host: GA-880GM-UD2H 
Kernel: 5.4.36-gnu 
Uptime: 1 hour, 8 mins 
Packages: 55 (guix-system), 136 (guix-user) 
Shell: bash 5.0.7 
Resolution: 1920x1200 
DE: GNOME 
Theme: Adwaita [GTK2/3] 
Icons: Adwaita [GTK2/3] 
Terminal: .gnome-terminal 
CPU: AMD Athlon II X3 455 (3) @ 3.300GHz 
GPU: NVIDIA GeForce 8400 GS Rev. 3 
Memory: 1000MiB / 7960MiB
christopher@nightshade ~$ emacs --version
GNU Emacs 26.3
Copyright (C) 2019 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GNU Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.

-- 
Christopher Howard
p: +1 (907) 374-0257
w: https://librehacker.com
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