[Toybox] cksum tests

[Elie De Brauwer]

Hello all,

In attach you can find two patches, the first one adds a bunch of tests 
for the cksum command. The second patch fixes the cksum helpstring, the 
options were not listed correctly and the -N option wasn't very clearly 
explained (I lived in the illusion that it would simply suppress the 
output of the 2nd column).

my 2 cents
E.

-- 
Elie De Brauwer

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