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='2018-05-29 18:29:36 +0200'>2018-05-29</span></td><td><a href='/guix/commit/CODE-OF-CONDUCT?id=a076f19908d06b6df49f1c25c40de8838213cd71'>CODE-OF-CONDUCT: Switch to version 1.4 of the Contributor Covenant.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>