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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