[PATCH] Allow the use of IPv6 nameservers

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This patch allows the use of IPv6 addresses for nameserves in both
/etc/resolv.conf and by using the ares_set_nameservers() API.

I know that some important parts are still missing (notably ares_dup()
must support this and also the ares_set_nameserves() public call must be
documented) but I wanted someone from upstream to review the approach
first..if it is deemed OK I will continue and fix the remaining issues.

Thanks also to Kamil Dudka for taking a preliminary look at the patch.

        Jakub
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