This removes builtin test's zero and one argument special modes.
That means:
- `test -n` returns false
- `test -z` returns true
- `test -x` with any other option errors out with "missing argument"
- `test foo` errors out as expecting an option

FLOG category "deprecated-test", run `fish -d deprecated-test` and it
will show any test call that would change in future.

faho deleted the test-deposixify branch

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