patch applied (ghc): Catch exceptions on Windows, to stop it popping up dialog boxes

[Simon Marlow]

Ian Lynagh wrote:
> Fri Aug  3 11:32:29 PDT 2007  Ian Lynagh <igloo at earth.li>
>   * Catch exceptions on Windows, to stop it popping up dialog boxes
>   Adaptated from code from Sigbjorn Finne
> 
>     M ./rts/Main.c -1 +5
>     A ./rts/seh_excn.c
>     A ./rts/seh_excn.h

maybe move these files under rts/win32?  (I'm trying to generally move in 
the direction of having platform-specific code in either win32/ or posix/)

Cheers,
	Simon