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resolv: fix gethostbyname2_r to match gethostbyname_r, fixing bugs with AAAA lookups
The latter half of gethostbyname2_r (doing AAAA queries) is rather dramatically different
from the corresponding portion of gethostbyname_r (doing A queries). This leads to problems
like calls to getaddrinfo only returning one IPv6 address, even when multiple exist.
Seems to be entirely a case of divergent evolution -- a half-decade of fixes for the IPv4
code but no love for IPv6. Until now. ;)
DNS behaviour for IPv6 is really no different than for IPv4 -- beyond the difference in
address sizes, there's no need for the functions to be so different.
Consequently, this patch really is almost just a cut-and-paste of gethostbyname_r, with
the appropriate substitutions of in6_addr, AF_INET6, etc; while holding on to the few
extra bits that actually belong in there (eg #ifdef __UCLIBC_HAS_IPV6__).
Signed-off-by: Wes Campaigne <westacular@gmail.com>
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