winsock: add check for sin6_scope_id

[Alexandre Julliard]

Vitaly Lipatov <lav at etersoft.ru> writes:

> On old systems sin6_scopy_id was not exist.
> I add a check for it in configure.ac and ifdefs in c file.
>
> Changelog:
> add check for sin6_scope_id is exist

You should use AC_CHECK_MEMBERS for this.

-- 
Alexandre Julliard
julliard at winehq.org