A Bjrn Reese patch.

This can be optimized a tidbit, but this is a start.

Now first check if IPv6 is supported, then use PF_UNSPEC. If not, use PF_INET.
It'll solve both the "slow name lookup" problem on IPv4 and still work fine on
IPv6 hosts.

Bug report #530204 has more details:
http://sourceforge.net/tracker/?func=detail&atid=100976&aid=530204&group_id=976

functionality and this change reverts this.

However, with this revert we bring back problems on (some/all?) non-IPv6
enabled Linux machines that have getaddrinfo().

Really, we should only #define this in one file, not both here and in
connect.c!

on IPv4-linux machines

all platforms, I also edited a few data types slightly to prevent my
compiler from warning on comparisions between signed and unsigned values

fine..

host:port, so accessing curl.haxx.se on port 80 would yield a key value
of ::
curl.haxx.se:80

2) in the curl_dns_cache_entry structure, timestamp should be
a time_t instead of an integer (although I doubt it matters).

The default cache timeout for this is 60 seconds, which is arbitrary and
completely subject to change :)

    - Use a global dns cache (via setting the tentatively named,
    CURLOPT_DNS_USE_GLOBAL_CACHE option to true)
    - Use a per-handle dns cache, by default
    - Use a pooled dns cache when in the "multi" interface

more CPU architectures

makes it easier to disable debug output when built with debug functions

the pack_hostent() is only compiled if gethostbyname_r() isn't present.

for when gethostbyname() is used so that we have the memory of the struct
allocated. This turns out to be needed if the curl handled is passed between
threads on Windows and possibly other operating systems where we use that
function.

gethostbyname_r() function, most notably windows machines...

be posted in a minute to the libcurl list.