A patch to bypass MS' sillyness with regard to IPv6 and getaddrinfo().

The CURLDEBUG part is to avoid redefinition warning caused by memdebug.h. If
ENABLE_IPV6 isn't enabled, it doesn't matter since we never call
getaddrinfo(). Allthough we could to support weird protocols like SOCK_RDM
that Win-2K/XP has.

new configure script detects them and now this code acts according to what
API that was detected

Added a more verbose comment about what strerror_r() can set errno to in
case of failure.
This file still doesn't build on Solaris due to a missing 'sys_nerr' symbol.

Curl_strerror() that attempts to be thread-safe _and_ works on Windows too!

if large file support is available

when converting to ints

999 days

to a "days + hours" or even "just days" display if the time value is very
large. I also switched several calculations over to fixed-point instead of the
previous doubles.

true.