patch applied (packages/random): Add a comment about why we can't use abs to get a non-negative number

[Ian Lynagh]

Wed Mar  9 09:43:45 PST 2011  Ian Lynagh <igloo at earth.li>
  * Add a comment about why we can't use abs to get a non-negative number
  NB: Negative seends will now produce different random numbers than
  they used to.

    M ./System/Random.hs +2

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=packages/random;a=darcs_commitdiff;h=20110309174345-3fd76-0cc814136e8e3696da13e1478d81ee67d259f082.gz