RFC3484 precedence table for fec0::/10 and fc00::/7 (site-local
and ULA respectively). Set precedence for IPv4 address to 10 as
defined in RFC3484 for preferring IPv6.
* posix/gai.conf: Update to match the new default tables.
handling. /etc/gai.conf can contain replacements for the label
and precedence table. Fix byte order of default label and
precedence table.
* posix/gai.conf: New file.
* posix/tst-rfc3484.c: Adjust for changes to getaddrinfo.c.
* posix/tst-rfc3484-2.c: Likewise.