[GHC] #7130: Give suggestions for unknown command line flags

[GHC]

#7130: Give suggestions for unknown command line flags
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 Reporter:  nomeata           |          Owner:                  
     Type:  feature request   |         Status:  new             
 Priority:  normal            |      Component:  Compiler        
  Version:  7.5               |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 I noticed that GHC does not do that yet, even though suggestions are given
 almost every else, so I came up with this simple patch.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7130>
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