[GHC] #5660: Remove out-of-date NOTE files

[GHC]

#5660: Remove out-of-date NOTE files
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    Reporter:  shelarcy          |        Owner:              
        Type:  task              |       Status:  new         
    Priority:  normal            |    Milestone:              
   Component:  Compiler          |      Version:  7.3         
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by simonmar):

 `compiler/DLL-NOTES` appears to be obsolete too, I'll remove it.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5660#comment:2>
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