[GHC] #15950: Hadrian build fails on Windows

[GHC]

#15950: Hadrian build fails on Windows
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Build System      |              Version:  8.6.2
  (Hadrian)                          |
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I see, `Settings.Default.stage1Packages` conditions both `iserv` and
 `libiserv` on the platform not being Windows. However, then
 `Rules.Test.needIservBins` depends upon `iserv` regardless. This all seems
 terribly fragile.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15950#comment:4>
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