Stem jenkins tests unable to invoke tor

Hi lovely sysadmins. Our jenkins tests are failing due to being unable to find tor...

https://jenkins.torproject.org/job/stem-tor-ci/

  checking stem version...                             1.6.0-dev
  checking tor version...                              failed

./RESULT/tor --version returned exit status 127

This happened before on...

https://trac.torproject.org/projects/tor/ticket/22790