Added missing sys import call

[frankgasking]

Hi Jon,

I noticed that RC 1.85.00 was crashing on any sound playback - both coder and builder. This was due to a missing sys import under sound/backend_pyo.py which i've added in.

However, I also noticed that even if you put "pygame" as the default, it crashes with the same error - and tries to use backend_pyo.py instead of backend_pygame.py. Not sure if this is an additional error, but couldn't spot anything obvious.

Best wishes,

Frank

[coveralls]

Coverage remained the same at 51.752% when pulling 3b78d8e on frankgasking:soundpyo-patch into 5029631 on psychopy:master.

[codecov-io]

Codecov Report

Merging #1365 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1365   +/-   ##
=======================================
  Coverage   47.33%   47.33%           
=======================================
  Files         237      237           
  Lines       37357    37357           
  Branches     5796     5796           
=======================================
  Hits        17684    17684           
  Misses      18026    18026           
  Partials     1647     1647

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