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='2020-11-19 20:48:26 +0200'>2020-11-19</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=8ed4c468ab611409902c00bdf7c21fdb8d312928'>gnu: Don't append '.git' to GitHub uris.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
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<tr><td><span title='2020-10-20 00:16:43 +0300'>2020-10-20</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=bdb030a7dc5bf84365d7f77935e838f848e02786'>gnu: lxqt-session: Wrap startlxqt executable.</a><span class='msg-avail'>...</span></td><td>Reza Alizadeh Majd</td></tr>
<tr><td><span title='2020-10-20 00:16:43 +0300'>2020-10-20</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=9aa35795d3379de2ee2f0a6fffae61331a4da344'>gnu: lxqt-session: Fix xsession entry exec path.</a><span class='msg-avail'>...</span></td><td>Reza Alizadeh Majd</td></tr>
<tr><td><span title='2020-09-06 09:16:11 +0300'>2020-09-06</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=10ba62ec63f80044c8652a9869f13585f2014ebe'>gnu: lxqt-panel: Patch xkeyboard-config location.</a><span class='msg-avail'>...</span></td><td>Hamzeh Nasajpour</td></tr>
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<tr><td><span title='2020-07-17 03:04:41 +0200'>2020-07-17</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=5654eef7e9d32e3a1981417d5db7de7b4f9f5391'>gnu: Update the LXQt home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-07-12 23:08:15 +0200'>2020-07-12</span></td><td><a href='/guix/commit/gnu/packages/lxqt.scm?id=b0e7b6992f3f845e83cfbca4d700b51dba50b4d5'>gnu: Remove ".git" from "https://github/…/….git".</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>