patch applied (ghc): call ShutdownIOManager() before closing handles

[Simon Marlow]

Wed Aug 30 05:31:31 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * call ShutdownIOManager() before closing handles
  To avoid IO requests completing only to discover that the
  completed_table_sema has been CloseHandle()'d.  This all looks a bit
  wrong, though: we shouldn't really be waiting for these requests to
  complete, they might take forever.

    M ./rts/win32/AsyncIO.c -1 +1