of using 'lud_filter' after freeing 'lud_dn'.

Patch for ldap.c under Windows. It works with wldap32.dll as supplied with
Win-98/ME/2000/XP, so no extra .dlls are required.  I've mostly tested it
against Verisign's ldap server. Added code in the case there are to many
responses (rc = LDAP_SIZELIMIT_EXCEEDED) and print only those we got. E.g.

curl
ldap://directory.verisign.net/?cn,display-name,mail,info?subtree?(cn=*Nelson*)

will print the first 10 results.

My only problem with it is that ldap_search_s() fails with "filter error" when
CURLDEBUG is defined ?! Maybe someone can spot the error.

initial basic valgrind-log scan for memory leaks it could detect.

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.