Patch for s390x support

[Neale Ferguson]

Thanks. I’ll just let s390x default to the gcc builtins when available.

On 10/14/15, 12:26 PM, "nginx-devel on behalf of Maxim Dounin"
<nginx-devel-bounces at nginx.org on behalf of mdounin at mdounin.ru> wrote:

>
>No.  The s390x platform certainly isn't that popular to justify an
>in-house atomic operations implementation.  In case someone wants
>to use a compiler without builtin atomic operations, the libatomic
>library can be used (or nginx can be used without atomic
>operations at all).
>
>I would rather like to see C11 atomics support added - they aren't
>currently supported by nginx.