Thomas Medioni authored Mar 31, 2017 and Alexandre Duret-Lutz committed Mar 31, 2017

* NEWS: mention this fix.
* bench/stutter/stutter_bench.sh, bench/stutter/user.sh: Path to spot
  binaries would include an inexistant src directory.
* bench/stutter/stutter_invariance_formulas.cc: Add override qualifier
  to satisfy -Wsuggest-override.