[oe] git and dir

[Rolf Leggewie]

Phil Blundell wrote:
> What's the specific corruption that you're worried about?

Maybe my worries are unfounded and that would be great.  I was thinking 
that building for a certain distribution but changing the checked out 
repo underneath its feet back and forth could eventually result in 
incompatible stuff getting into TMPDIR and particularly staging.  Think 
switching between dev, stable, openmoko and some of its variant and 
building stuff in between.  I don't think it is too far-fetched to worry 
this might lead to some incompatabilities in what is under TMPDIR.