[PATCH] features.h: do not consider _GNU_SOURCE for gets

[Arsen Arsenović]

Arsen Arsenović <arsen@aarsen.me> writes:

> Currently, -std=c99 -D_GNU_SOURCE and similar lack the 'gets'
> declaration.
>
> This causes, say, programs using the:
>
>   extern __typeof__ (gets) function __attribute__ ((__warning__ (...)))

There's a typo there.  That's meant to be:

  extern __typeof__ (gets) gets __attribute__ ((__warning__ (...)))

... of course.
-- 
Arsen Arsenović
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