build: reports: add pahole target

Poke-a-hole (pahole) is an object-file analysis tool to find the size of
the data structures, and the holes caused due to aligning the data
elements to the word-size of the CPU by the compiler.

http://git.kernel.org/cgit/devel/pahole/pahole.git

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
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