Skip git pub tests as they do not work on Windows buildbots.

Skip git pub tests as they do not work on Windows buildbots.

They work locally on my machine.

R=rnystrom@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=13966

[Bob Nystrom, 2012-10-23 14:08:39]

Yup, this is the other known issue I'm planning to look into when I get a
chance. It runs fine locally, and it even runs fine if you log into the
buildbots and run it manually. But when the bot script itself runs it... fail.

I sent an email to the team a couple of weeks ago (heh, look for "plea for
help") about this. Peter's suggestion, which I haven't had a chance to follow up
on yet, is that it has something to do with drive letters and spawned processes.

For some reason, when we spawn the 7zip process on the buildbot, it doesn't have
the correct working directory.