[xmonad] darcs patch: get rid of zombies in a more portable way

[Jeremy O'Brien]

On Sun, Apr 11, 2010 at 09:03:13PM +0200, Tomas Janousek wrote:
> Sun Apr 11 20:55:10 CEST 2010  Tomas Janousek <tomi at nomi.cz>
>   * get rid of zombies in a more portable way
>   
>   FreeBSD and OpenBSD don't support the signal(SIGCHLD, SIG_IGN) way of dealing
>   with them. Wikipedia quote on the issue:
>   
>   "POSIX.1-2001 allows a parent process to elect for the kernel to automatically
>   reap child processes that terminate by setting the disposition of SIGCHLD to
>   SIG_IGN or by setting the SA_NOCLDWAIT flag for the SIGCHLD signal; Linux 2.6
>   kernels adhere to this behavior while FreeBSD supports only the latter of
>   these methods. Because of historical differences between System V and BSD
>   behaviors with regard to ignoring SIGCHLD, calling wait remains the most
>   portable paradigm for cleaning up after forked child processes."
>   

I confirm that I was afflicted with this issue, and this patch fixed it
for me. Thanks!