select() overhaul fix.

to fail in mysterious ways.

shadow our public headers with the former names.

Force including ../include/curl/easy.h.

Force including ../include/curl/multi.h.

using a custom Host: header and curl fails to send a request on a re-used
persistent connection and thus creates a new connection and resends it. It
then sent two Host: headers. Cyrill's analysis was posted here:
http://curl.haxx.se/mail/archive-2005-01/0022.html

problem with the version byte and the check for bad versions. Bruce has lots
of clues on this, and based on his suggestion I've now removed the check of
that byte since it seems to be able to contain 1 or 5.

handles. Include multi.h to get proto.

#1098843. In short, a shared DNS cache was setup for a multi handle and when
the shared cache was deleted before the individual easy handles, the latter
cleanups caused read/writes to already freed memory.

remote certificate name when it didn't match the used host name.

test, see test 509

to 8(!) or similar lengths passwords

host name 'ip6-localhost' in /etc/hosts (or similar) since the test case uses
that host name to test the IPv6 name to address resolver.

lib/config.h.in file by buildconf

longer use Angus Mackay's getpass code due to the weirdo license his code was
donated to us under.

protocols that are disabled.