siteinfo: add linux-gnu os
siteinfo: add linux-gnu os

Aside: should really shift most of the bits from this class into a python
module in the oe package, which would make it possible to manipulate the data
from the metadata if necessary.

Signed-off-by: Chris Larson <4c8c411260e601995081b113a5ef94a26eff2b25@mentor.com>

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