build failed on Linux with x32 ABI

[Serguei I. Ivantsov]

Hi,

Nginx failed to build on Linux with x32 ABI.

>In file included from /usr/include/sys/sysctl.h:63:0,
>                 from src/os/unix/ngx_linux_config.h:54,
>                 from src/core/ngx_config.h:26,
>                 from src/core/nginx.c:8:
>/usr/include/bits/sysctl.h:19:3: error: #error "sysctl system call is
>unsupported in x32 kernel"
> # error "sysctl system call is unsupported in x32 kernel"

sysctl() is only used within RTSIG module, but included anyway in
ngx_linux_config.h.

Please find the patch attached to address the issue.

--
 Serguei I. Ivantsov
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