[Toybox] [landley/toybox] Add -0 to env. (8ab2d8a)

[Rob Landley]

On 05/26/2017 10:23 AM, technosaurus wrote:
> Should this be |xprintf("%s%c", *ev, '\n'*!(toys.optflags&FLAG_0));| ???

Oops. (Legitimate typo, adjacent keys.)

I tested env -0 and env without -0 before checking it in, but that turns
_any_ flag into -0, which I didn't check. :)

Thanks,

Rob