[GHC] #2365: Warn about suspicious flags in OPTIONS_GHC pragmas

[GHC]

#2365: Warn about suspicious flags in OPTIONS_GHC pragmas
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    Reporter:  igloo            |       Owner:             
        Type:  feature request  |      Status:  new        
    Priority:  normal           |   Milestone:  6.10 branch
   Component:  Compiler         |     Version:  6.8.2      
    Severity:  normal           |    Keywords:             
  Difficulty:  Unknown          |    Testcase:             
Architecture:  Unknown          |          Os:  Unknown    
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 We should warn if suspicious flags are given in `OPTIONS_GHC` pragmas; in
 particular, if any `-XLanguage` flag is used.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2365>
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