definition of "AF_INET6". Declare those functions and, if it's not
defined, define "AF_INET6" in "inet_v6defs.h", and arrange to include
it if "inet_ntop()" is missing. (Systems will probably have both of
them or lack both of them, and we may choose not to use the system's
"inet_pton()" because it's buggy, so base the decision on whether to
include "inet_v6defs.h" on whether we're using the system's
"inet_ntop()" or not.) Fix some macro references in "Makefile.am" and
"configure.in".
svn path=/trunk/; revision=830
for converting IPv[46] numeric notation to/from binary form.
recent BIND includes those functions so fallback is not necessary on
most of the platforms.
sorry if it raises any portability problem on other platforms.
remove partial inclusion of inet_ntop() in packet-ipv6.c.
move ip6_to_str() to packet.c, it fits better there than packet-ipv6.c.
svn path=/trunk/; revision=829
Guy Harris