Source-highlight support has been replaced upstream with python3-pygments.
(From OE-Core rev: 25a26ee7bc73a9a475f89cf9fc7876a4e75a26f4)
Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>