[oe] Cleaning up SDK/Toolchain

[Graeme Gregory]

> > * We implement packaged staging and only stage the dependencies
> > needed for each package.
> 
> That would be a better approach. Graeme, do you still want to have a
> shot at implementing a unionfs based approach?
> 
I do think that would be a neat solution to avoid running gzip/unzip
for every package. And should be doable with a LD_PRELOAD type system
that just redirects open() and its familly. Im sure I saw one once
on freshmeat.net Ill try and dig it out.

Graeme (XorA)