[GHC] #9623: Use Data.List.dropWhileEnd

[GHC]

#9623: Use Data.List.dropWhileEnd
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              Reporter:  dfeuer      |            Owner:  dfeuer
                  Type:  task        |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  libraries   |          Version:  7.8.3
  (other)                            |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by dfeuer):

 Replying to [comment:15 nomeata]:
 > Reopening due to changeset:d6d5c127b86dc186b25add2843cb83fc12e72a85.
 David, your `dropWhileEndLE` is not available outside GHC, right? So
 `GHC.Windows` should not use it?

 Ay, you're right. That one should just use `Data.List.dropWhileEnd`
 instead. Now I just have to figure out how to modify the commit (ugh).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9623#comment:17>
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