patch applied (ghc): Don't warn of duplicate exports in case of module exports.

[Ian Lynagh]

Sat Nov 27 13:21:16 PST 2010  Michal Terepeta <michal.terepeta at gmail.com>
  * Don't warn of duplicate exports in case of module exports.
  
  But only when the module exports refer to different modules.
  See ticket #4478.

    M ./compiler/rename/RnNames.lhs -2 +10

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101127212116-c9c37-f769c6d611b39c5261a82e194d787cc30a5c4afd.gz