[project @ 2003-12-23 13:58:17 by simonmar]

- Fix up mingw build after changes to hGetBuf etc.
  I don't think that hGetBufNonBlocking works correctly on Windows,
  because there doesn't seem to be a non-blocking read primitive.  I
  haven't tested it, however.

- Clean up Unix versions of the low-level read/write functions in
  Handle.hs.  Now that these aren't used on Windows, they can be
  made simpler.