On May 4th, Bjørn Mork provided patch
697bbc7b832048d3a679cd55caf2268a325efbe0 to include objtool binaries in
the headers package. Sadly, that one only works if $srctree=$objtree,
because the objtool binaries are not written to the srctree, but
to the objtree.

Signed-off-by: Wilfried Klaebe <w-lkml@lebenslange-mailadresse.de>