Window build broken

[Ryan Scott]

Wow, I happened to try building GHC on Windows for the first time ever
today, and I also experienced this error :)

Interestingly, someone reported a very similar error to this on Trac,
but for GHC 7.8.3 [1]. Here's where the error message comes from [2]
in Linker.c:

    static int verifyCOFFHeader
    (COFF_header *hdr, pathchar *fileName)
    {
      if (hdr->Machine != 0x8664) {
        errorBelch("%" PATH_FMT ": Not x86_64 PEi386", fileName);
        return 0;
      }
      ...
    }

Ryan S.
-----
[1] https://ghc.haskell.org/trac/ghc/ticket/10437
[2] https://github.com/ghc/ghc/blob/233d1312bf15940fca5feca6884f965e7944b555/rts/Linker.c#L3355