[oe] RFC: CMAKE - support out of tree builds

[Robert Schuster]

Hi,
I am proposing the attached patch to make it possible to do out-of-tree
builds in OE. Out-of-tree builds should be preferred but I do not want
to look at every recipe if it still works.

OTOH I want to include llvm 2.5 with its new cmake-based build system
which incidentally does *not* permit in-tree builds.

Regards
Robert
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