Traverse the entities hash's keys in sorted order to ensure reproducibility.

--- libhubbub-0.3.3/build/make-entities.pl
+++ libhubbub-0.3.3/build/make-entities.pl
@@ -86,7 +86,7 @@
 
 my $trie;
 
-foreach my $key (keys %entities) {
+foreach my $key (sort keys %entities) {
    $trie = insert_node($trie, $key, $entities{$key});
 }
 
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<tr><td><span title='2020-01-12 00:19:10 +0100'>2020-01-12</span></td><td><a href='/guix/commit/doc/htmlxref.cnf?id=30d83f445b70ebce7f01eaa91c8f418ff0a98321'>doc: Update htmlxref.cnf.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/htmlxref.cnf: Update from Texinfo.  Add entries for "mes",
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<tr><td><span title='2019-05-04 23:07:38 +0200'>2019-05-04</span></td><td><a href='/guix/commit/doc/htmlxref.cnf?id=e8f8363cdebb24dc359cadba7ae0a689fb21fb99'>doc: Update htmlxref.cnf.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/htmlxref.cnf (G): Switch to https.
(geiser, guix.de, guix.es, hurd): New entries.
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<tr><td><span title='2018-07-05 22:16:10 +0200'>2018-07-05</span></td><td><a href='/guix/commit/doc/htmlxref.cnf?id=c35f77c5a07690fc9d369ed4b751a5a9e5de6cf1'>doc: Update URL of the Emacs-Guix manual.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/htmlxref.cnf (EMACS_GUIX): Update URL.
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* doc/htmlxref.cnf: Add "guix.fr".
</span></span></td><td>Ludovic Courtès</td></tr>