[GHC] #11096: Builtin encoder/decoder should be used for Latin-1

[GHC]

#11096: Builtin encoder/decoder should be used for Latin-1
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           Reporter:  bgamari        |             Owner:  hvr
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Filed on behalf of hvr.

 Currently `mkTextEncoding'` delegates decoding/encoding from/to latin-1 to
 `iconv`. This shouldn't be necessary as we have latin-1 an encoder in
 `base`. Let's use it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11096>
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