[GHC] #9713: Update comment about C helper for dynamic exports.

[GHC]

#9713: Update comment about C helper for dynamic exports.
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       Reporter:  int-e              |                   Owner:
           Type:  task               |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.8.3
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Easy (less than 1  |         Type of failure:  Other
  hour)                              |               Test Case:
     Blocked By:                     |                Blocking:
Related Tickets:                     |  Differential Revisions:
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 The offending comment is in {{{compiler/deSugar/DsForeign.lhs}}}.

 The RTS API has changed so that {{{rts_evalIO}}} takes a capability as its
 first argument; so make the comment reflect reality.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9713>
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