cerbero: Fix syntax errors in VS env functions
cerbero: Fix syntax errors in VS env functions

And also some logic errors.

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