system/diffutils: diff -D does not work correctly

Regression in diffutils version 3.9.

See also:

• https://bugs.gnu.org/61193
• https://lists.gnu.org/archive/html/bug-diffutils/2023-01/msg00011.html
• https://git.savannah.gnu.org/cgit/diffutils.git/commit/?id=ba08fbbb0ca5da455bf695236c57bc50e7faed50