This is another case of legacy/trac#5355 which was introduced by [ba3a5f82f11388237a3ba4995ddf0b6ffaaf492a](https://gitweb.torproject.org/tor.git/commit/?id=ba3a5f82f11388237a3ba4995ddf0b6ffaaf492a). Found this while looking at the Tor builds on Debian (see https://buildd.debian.org/status/logs.php?pkg=tor&arch=hurd-i386).