[GHC] #9056: --make paths are not deduplicated

[GHC]

#9056: --make paths are not deduplicated
-------------------------------------+-------------------------------------
              Reporter:              |            Owner:
  evincarofautumn                    |           Status:  new
                  Type:  bug         |        Milestone:
              Priority:  normal      |          Version:  7.8.2
             Component:  Driver      |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:  Incorrect   |       Blocked By:
  warning at compile-time            |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * difficulty:  Unknown => Easy (less than 1 hour)
 * component:  Compiler => Driver


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9056#comment:1>
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