[ping] Use malloc and free in atexit only when available.

[Jeff Johnston]

Kazu Hirata wrote:
> Hi,
>
> Could somebody review the following patch?
>
>   [patch] Use malloc and free in atexit only when available.
>   http://sourceware.org/ml/newlib/2009/msg00011.html
>
> Thanks,
>
> Kazu Hirata
>   
Sorry for the delay on this.

There is a problem with this patch.  It does not effectively leave in 
the configuration
option because for platforms that don't support weak or don't support 
attributes, the free
call will drag in free which isn't the case today.

-- Jeff J.