[Toybox] realpath implementation

[Andre Renaud]

Hi Elie,

> Just a question/suggestion, now you're using your own
> 
> char buffer[PATH_MAX];
> 
> to hold your result, why not make use of the globally existing char
> toybuff[4096] (see toys.h/main.c), most other tools make use of this
> buffer for similar needs.

Thanks for that - I wasn't aware of the toybuf scratch space.

Attached is the (trivially) updated implementation.

Regards,
Andre
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