[PATCH:twm] Fix: menus.c:2374: warning: implicit declaration of function `putenv`

[Cyril Brulebois]

Alan Coopersmith <alan.coopersmith at oracle.com> (10/05/2011):
> Ensure _GNU_SOURCE is defined on Linux builds before including <stdlib.h>
> so the prototype is exposed in the header properly.
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=32696
> 
> Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

Reviewed-by: Cyril Brulebois <kibi at debian.org>

Mraw,
KiBi.
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