[DuncanBentley]

test_od_zero_byte_type_size (added in #16086) fails now and then in CI, for example on the use-cross Ubuntu job of #16079 and #16080:

run: coreutils od -tx0
called `Result::unwrap()` on an `Err` value: Custom { kind: Other, error: "failed to write to stdin of child: Broken pipe (os error 32)" }

od rejects the type and exits before reading its input, so writing "abcd" to its stdin can race with the exit. This adds ignore_stdin_write_error() to the failing cases, as other tests already do in this situation. The success case at the end of the test is unchanged.

[sylvestre]

Thanks for your PR