Make sure, that vtysh_cmd.c is deterministically generated.

--- a/vtysh/extract.pl.in	2017-03-10 13:55:06.000000000 +0100
+++ b/vtysh/extract.pl.in	2017-06-24 00:51:56.460000000 +0200
@@ -214,7 +214,7 @@
 }
 
 # Output DEFSH
-foreach (keys %live) {
+foreach (sort keys %live) {
     my ($proto);
     my ($key);
     $key = $live{$_};
@@ -229,7 +229,7 @@
 {
 EOF
 
-foreach (keys %odefun) {
+foreach (sort keys %odefun) {
     my ($node, $str) = (split (/,/));
     $cmd = $ocmd{$_};
     $cmd =~ s/_cmd/_cmd_vtysh/;
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<tr><td><span title='2020-09-15 14:40:20 +0200'>2020-09-15</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=1b157bbef0032121c88be2bbb834846115ce9341'>services: bitlbee: Support libpurple plugins.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/messaging.scm (bitlbee-shepherd-service): Pass
PURPLE_PLUGIN_PATH as #:environment-variables.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-13 23:12:43 +0100'>2019-03-13</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=59e80445882f8b0379e54916f89510c0deda6698'>Remove traces of "GuixSD".</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/bootloader/extlinux.scm (extlinux-configuration-file): Remove
mentions of "GuixSD".
* gnu/bootloader/grub.scm (install-grub-efi): Likewise.
* gnu/build/vm.scm (make-iso9660-image): Change default #:volume-id to
"Guix_image".
(initialize-hard-disk): Search for the "Guix_image" label.
* gnu/ci.scm (system-test-jobs, tarball-jobs): Remove "GuixSD".
* gnu/installer/newt/welcome.scm (run-welcome-page): Likewise.
* gnu/packages/audio.scm (supercollider)[description]: Likewise.
* gnu/packages/curl.scm (curl): Likewise.
* gnu/packages/emacs.scm (emacs): Likewise.
* gnu/packages/gnome.scm (network-manager): Likewise.
* gnu/packages/julia.scm (julia): Likewise.
* gnu/packages/linux.scm (alsa-plugins): Likewise.
(powertop, wireless-regdb): Likewise.
* gnu/packages/package-management.scm (guix): Likewise.
* gnu/packages/polkit.scm (polkit): Likewise.
* gnu/packages/tex.scm (texlive-bin): Likewise.
* gnu/services/base.scm (file-systems-&gt;fstab): Likewise.
* gnu/services/cups.scm (%cups-activation): Likewise.
* gnu/services/mail.scm (%dovecot-activation): Likewise.
* gnu/services/messaging.scm (prosody-configuration)[log]: Likewise.
* gnu/system/examples/vm-image.tmpl (vm-image-motd): Likewise.
* gnu/system/install.scm (installation-os)[file-systems]: Change root
file system label to "Guix_image".
* gnu/system/mapped-devices.scm (check-device-initrd-modules):
Remove "GuixSD".
* gnu/system/vm.scm (system-docker-image): Likewise.
(system-disk-image)[root-label]: Change to "Guix_image".
* gnu/tests/install.scm (run-install): Remove "GuixSD".
* guix/modules.scm (guix-module-name?): Likewise.
* nix/libstore/optimise-store.cc: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-01-10 14:59:23 +0100'>2019-01-10</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=65a67bf711b14bc7200f6730c0f173375ca12974'>services: Use 'define-deprecated' for service procedures.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/base.scm (urandom-seed-service, gpm-service): Define
using 'define-deprecated'.
* gnu/services/messaging.scm (bitlbee-service): Likewise.
* gnu/services/networking.scm (dhcp-client-service): Likewise.
(ntp-service): Likewise.
* gnu/services/xorg.scm (slim-service): Likewise.
(gdm-service): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-24 11:18:36 +0200'>2018-12-24</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=dcad57d5fca43a111e1b314264171c80d4d9a75b'>services: Add quassel.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/messaging.scm (&lt;quassel-configuration&gt;): New record type.
(%quassel-account, %quassel-activation): New procedures.
(quassel-service-type): New variable.
* gnu/tests/messaging.scm (%test-quassel): New variable.
(run-quassel-test): New procedure.
* doc/guix.texi (Messaging): Document quassel service.
</span></span></td><td>Efraim Flashner</td></tr>