patch applied (packages/base): make hGetBufNonBlocking do something on Windows w/ -threaded

[Simon Marlow]

Wed Sep 27 07:58:11 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * make hGetBufNonBlocking do something on Windows w/ -threaded
  hGetBufNonBlocking will behave the same as hGetBuf on Windows now, which
  is better than just crashing (which it did previously).

    M ./GHC/Handle.hs -1 +1
    M ./GHC/IO.hs -6 +7