bug#72445: shuf with both input-range and head-count biased

[Paul Eggert]

Thanks for the bug report. The bug appears to be due to a weakness in 
ISAAC that was reported in 2006 by Jean-Philippe Aumasson of the 
University of Applied Sciences Northwestern Switzerland. Although 
Aumasson wrote a paper about it, nobody seems to have connected the 
paper with coreutils.

I installed the attached patch, which fixed things for me, and am 
marking the bug as fixed.

0001-shuf-fix-randomness-bug.patch
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