[Buildbot] #2878: Windows escaping seem to produce problems

[Buildbot trac]

#2878: Windows escaping seem to produce problems
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Reporter:  sa2ajj   |       Owner:
    Type:  defect   |      Status:  new
Priority:  major    |   Milestone:  0.9.+
 Version:  0.8.9    |  Resolution:
Keywords:  windows  |
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Comment (by shoelzer):

 Whether dpb is right or wrong, all Visual C++ steps are broken as-is.

 http://docs.buildbot.net/current/manual/cfg-buildsteps.html#visual-c

 They all use a shell command with a list and expect `%VCENV_BAT%` to be
 expanded to a path. So either `win32_batch_quote` needs to change or the
 Visual C++ steps need an update to pass the command as a single string.

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Ticket URL: <http://trac.buildbot.net/ticket/2878#comment:18>
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