[PATCH] resolv: Remove support for RES_USE_INET6 and the inet6 option

[Florian Weimer]

* Adhemerval Zanella:

> Should we  should keep tst-res_use_inet6 to check if RES_USE_INET6
> is really not supported?

No, I don't think so.  It may make sense to have a test that checks that
with all supported options enabled, none of the legacy bits are set (of
which RES_USE_INET6 is just one).

Thanks,
Florian