aio/unix: Use signal.sival which is standard

[Sepherosa Ziehau]

Hi,

> diff --git a/src/os/unix/ngx_freebsd_config.h b/src/os/unix/ngx_freebsd_config.h
> --- a/src/os/unix/ngx_freebsd_config.h
> +++ b/src/os/unix/ngx_freebsd_config.h
> @@ -91,6 +91,10 @@
>  #if (NGX_HAVE_FILE_AIO)
>  #include <aio.h>
>  typedef struct aiocb  ngx_aiocb_t;
> +
> +#if (__FreeBSD_version < 700005 && !defined __DragonFly__)
> +#define sival_ptr                 sigval_ptr
> +#endif
>  #endif

Will the following code be more straightforward?
#if defined(__FreeBSD__) && (__FreeBSD_version < 700005)
#define sival_ptr sigval_ptr
#endif

Thanks,
sephe

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