stat: bad error message when directory doesn't exist

[Devel08]

in GNU stat, the error message means cannot statx, as in the syscall statx(2), not the util name itself.
Closes #13012

[Devel08]

Can we add

# spell-checker:ignore statx
# spell-checker:ignore Statx

to the cspell dictionary?

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/symlink (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/tail-n0f (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/cp/link-heap is now passing!
Congrats! The gnu test tests/printf/printf-surprise is now passing!
Skip an intermittent issue tests/pr/bounded-memory (was skipped on 'main', now failing)

[Devel08]

@oech3 should I do that in this pr or in a separate one?

[cakebaker]

Thanks!