[PATCH] Fix PR gdb/23835: Don't redefine _FORTIFY_SOURCE if it's already defined

[Sergio Durigan Junior]

On Wednesday, October 31 2018, Joel Brobecker wrote:

>> Thanks for the review, Joel.
>> 
>> Given that two global maintainers replied and approved the patch, I
>> assume it's OK if I go ahead and push it...?
>
> Yes, sorry. That was part of the intent of my message; it's
> a small patch anyway, so if we find there are problems with it,
> or objections we can't resolve quickly, it's easy to revert.

Thanks, Joel.  I pushed the patch now.

656efb5e2691b2bd29573d9985d20206c47b6927

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Sergio
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