curlx_-functions with the new prefix to prepare this code for the future
removal of several curl_-functions from the public libcurl API.

curlx_ functions are NOT part of the offical API, but only available as source
code functions from the lib directory in case of need.

trace if a test results in a 'core' file and gdb is present

libcurl.

work when using proxy by converting the IDN-name to the ACE-encoded version
before the request-URL is passed to the proxy.

from time to time!

and then figure it out with a suitable windows call.

all things up to work with encoded host names internally, as well as keeping
'display names' to show in debug messages. IDN resolves work for me now using
ipv6, ipv4 and ares resolving. Even cookies on IDN sites seem to do right.

disabled SSL with --without-ssl. This previously made the Makefiles use
the SSL libs even though told not to.

the correct config.h for the platform, and when this is done the USE_MANUAL
define is properly known.

and when I modified it slightly the warning dissappeared...