[Toybox] Fwd: toybox - added cmp

[Tim Elliott]

I'm attaching an implementation of head. The patch also removes a
comment in toys/nice.c.

Notes:
  * The spec states "The application shall ensure that the number
option-argument is a positive decimal integer." and this doesn't do
that. GNU coreutils has some kind of special behavior when n < 0
  * I noticed get_line() in lib/lib.c. Should I be using that instead?

Cheers,
Tim
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