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='2018-12-08 22:50:17 +0200'>2018-12-08</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=4ad62876cb85ebab8e8607afb5e90844acbcfafd'>gnu: quassel: Update to 0.13.0.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
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<tr><td><span title='2018-06-26 02:17:03 +0200'>2018-06-26</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=19621509dc6137144f813da6765d168b393ef1e0'>gnu: irssi: Return #t from all phases.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-06-03 15:49:50 +0300'>2018-06-03</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=68ddfb2e8d43de248a64a9baf34ff7002053ede6'>gnu: quassel: Fix building with Qt 5.11.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-04-27 02:56:45 +0200'>2018-04-27</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=5b292eac73d6dbc88b79a5ba9e122fca0b8af345'>gnu: quassel: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
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<tr><td><span title='2018-03-20 17:17:58 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=4a78fd4617908546be15d2c101f5cab512c71f8e'>Correct name and Email for ng0.</a><span class='msg-avail'>...</span></td><td>ng0</td></tr>
<tr><td><span title='2018-03-19 22:26:41 +0100'>2018-03-19</span></td><td><a href='/guix/commit/gnu/packages/irc.scm?id=901012356511eda3744703d81bbd08d863624219'>gnu: weechat: Update to 2.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
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