Do not apply ganglia-client recipe on Windows.

Ganglia is not supported on Windows. Avoid applying the linux recipe
on Windows.
Merge pull request #38 from ociuhandu/pull-req-release-pebbles-master-58a2078e8676eb14d4439f36e1ad3e1385f0a21b

https://github.com/crowbar/barclamp-ganglia/pull/38

Merged by devtool for VictorLowther