diffutils: update 3.9 -> 3.10

* Noteworthy changes in release 3.10 (2023-05-21) [stable]

** Bug fixes

  cmp/diff can again work with file dates past Y2K38
  [bug introduced in 3.9]

  diff -D no longer fails to output #ifndef lines.
  [bug#61193 introduced in 3.9]

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>
(cherry picked from commit 925155ac)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
(cherry picked from commit 21e40166)
Signed-off-by: Steve Sakoman <steve@sakoman.com>