cerbero: PYTHONPATH must match exactly in Python 3.7.1
cerbero: PYTHONPATH must match exactly in Python 3.7.1

Tested with:

Python 3.5.4
Python 3.6.6
Python 3.7.0
Python 3.7.1

Closes https://gitlab.freedesktop.org/gstreamer/cerbero/issues/79

atsushieno/cerbero,fluendo/cerbero,fluendo/cerbero,nirbheek/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero,fluendo/cerbero,GStreamer/cerbero,atsushieno/cerbero,fluendo/cerbero,GStreamer/cerbero,nirbheek/cerbero,GStreamer/cerbero,atsushieno/cerbero,GStreamer/cerbero,nirbheek/cerbero,nirbheek/cerbero,atsushieno/cerbero