[GHC] #12209: Windows: ByteCodeLink can't find labels "lseek" and "write"

[GHC]

#12209: Windows: ByteCodeLink can't find labels "lseek" and "write"
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        Reporter:  thomie            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.0.1
  (Linker)                           |
      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 thomie):

 Changing `lseek` to `_lseek` makes `ffi017` pass. But if that is the
 correct fix (CPP guarded), then why did the test not fail for other ways
 than `WAY=ghci`?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12209#comment:1>
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