patch applied (ghc): Save the Win32 error code where necessary

[Simon Marlow]

Fri Jan 26 08:26:20 PST 2007  Simon Marlow <simonmar at microsoft.com>
  * Save the Win32 error code where necessary
  Similarly to the way we save errno across context switches and
  suspendThread/resumeThread, we must save and restore the Win32 error
  code via GetLastError()/SetLastError().  Fixes #896.
  
  

    M ./includes/TSO.h +3
    M ./rts/Schedule.c -2 +32