[ping] make __sf_fake_std{in,out,err} weak in impure.c

[Jeff Johnston]

Kazu Hirata wrote:
> Hi,
>
> Could somebody review the following patch?
>
>   PATCH: make __sf_fake_std{in,out,err} weak in impure.c
>   http://sourceware.org/ml/newlib/2007/msg00037.html
>
> Thanks,
>
> Kazu Hirata
>   
Patch checked in with modification to use the _ATTRIBUTE macro from _ansi.h.

-- Jeff J.