[haskell-platform] #206: add link for Chris Dorman's CentOS distro.

[haskell-platform]

#206: add link for Chris Dorman's CentOS distro.
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 Reporter:  MtnViewMark       |       Owner:  mzero     
     Type:  task              |      Status:  new       
 Priority:  major             |   Milestone:  2012.4.0.0
Component:  (none-specified)  |    Keywords:            
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 Chris said: "I have been maintaining RPMs for GHC and the Haskell Platform
 for CentOS 5 and 6 at http://www.justhub.org/download."

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/206>
haskell-platform <http://trac.haskell.org/haskell-platform>
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