diffutils: update 3.9 -> 3.10

Remove the comment addition from the patch body, as it
increases likelyhood of rebase conflicts, and repeats what
the commit says.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>