[GHC] #8200: Export languageExtensions from DynFlags

[GHC]

#8200: Export languageExtensions from DynFlags
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       Reporter:  Fuuzetsu          |             Owner:
           Type:  feature request   |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  GHC API           |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 As stated in the summary. I don't see any harm in it and I would
 personally find it useful for some extension manipulation as part of
 Haddock.

 This patch also clobbers trailing whitespace in the file.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8200>
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