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/;
</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='4498894b1b2b959e3c87d947659cbd5cc069df2e'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>refs</a><a class='active' href='/guix/log/gnu/services/linux.scm'>log</a><a href='/guix/tree/gnu/services/linux.scm?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>tree</a><a href='/guix/commit/gnu/services/linux.scm?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>commit</a><a href='/guix/diff/gnu/services/linux.scm?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/linux.scm'>
<input type='hidden' name='id' value='4498894b1b2b959e3c87d947659cbd5cc069df2e'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>root</a>/<a href='/guix/log/gnu?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>gnu</a>/<a href='/guix/log/gnu/services?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>services</a>/<a href='/guix/log/gnu/services/linux.scm?id=4498894b1b2b959e3c87d947659cbd5cc069df2e'>linux.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/linux.scm?id=4498894b1b2b959e3c87d947659cbd5cc069df2e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-01-06 19:18:58 +0100'>2021-01-06</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=3d3185b54448cb44fffc1badc8c1cf51bb76585d'>services: kernel-module-loader: Return a single 'shepherd-service'.</a><span class='msg-avail'>...</span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2020-09-13 23:07:36 +0200'>2020-09-13</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=71992a532dd0bb88b39dda285482b332a24dae66'>services: Fix zram-device-service.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-08-02 15:54:37 +0300'>2020-08-02</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=587e0d911dfff81647015e89847084b606e68f71'>services: Add zram-device-service.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-04-12 18:24:27 +0000'>2020-04-12</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=8e4d1493f1d56e29252eb7a36b3eee2a0e073ee4'>services: kernel-module-loader: Clean up.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2020-04-05 13:07:13 +0200'>2020-04-05</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=044d1478c9a63a64547c9cc320008f8d8fbf6791'>gnu: Add kernel-module-loader-service.</a><span class='msg-avail'>...</span></td><td>Brice Waegeneire</td></tr>
<tr><td><span title='2020-01-31 23:37:13 -0500'>2020-01-31</span></td><td><a href='/guix/commit/gnu/services/linux.scm?id=d3e439e355284f136ff13eb3e6fffb4661552f3b'>gnu: Add earlyoom-service-type.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>