asciidoc: use Python 3 port

There's a sort-of-official port of asciidoc to Python 3.  Whilst the official
replacement is asciidoctor which is rewritten in Ruby, this is a fairly trivial
swap and removes Python 2 from core-image-sato builds entirely.

Moving forward we should evaluate asciidoctor, but that can wait.

Change the RDEPENDS so that python3 is only a dependency for target and
nativesdk builds, for native this can use the host python3.

Remove redundant DESTDIR export that isn't needed.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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