[Toybox] id implementation

[Tim Bird]

Just to check things out, I implemented a rudimentary version
of 'id'.

Normally I'd send a patch, but since this is for one full self-contained
source file, I'm just going to attach it.

Let me know if I messed something up, or should send this in another
format.
 -- Tim

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Tim Bird
Architecture Group Chair, CE Workgroup of the Linux Foundation
Senior Staff Engineer, Sony Network Entertainment
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