when assigning a NULL pointer to a function pointer var.

In CURL_CHECK_LIBS_WINLDAP and CURL_CHECK_LIBS_LDAP, check first with no
additional library even when the optional list of libraries has been given.

Specifically for linux x86-64 with Intel's icc.

icc warning level with libcurl's

may lose significant bits

failure condition: http://curl.haxx.se/mail/lib-2007-10/0152.html

when assigning a NULL pointer to a function pointer var.

and allow parameter specification of libraries to check.

Fix a bug where fallback from AF_INET6 to AF_INET would not work properly together with relative search; if you had a search path of .a.com and .b.com, and foo.a.com would return ARES_ENODATA and foo.b.com would return ARES_ENOTFOUND, the lookup would not properly retry with AF_INET as it forgot the first ARES_ENODATA.

Don't confuse NUL with NULL.

CURLOPT_COPYPOSTFIELDS option added for dynamic.
Fix some OS400 features.

Fixed a typo in the LDAP configure code and made sure NULL is defined
in a test programs that need it.

My understanding is that we use "number" for discrete variables and
"amount" for continuous variables.

So you can say "The amount of flour required depends on..." or, "Last
night I consumed a large amount of beer!".

And, "That tank contains a large number of fish" or, "Over the week I
consumed a number of cases of beer."

I think that features are discrete, so the man page would read "...the
number of features will make your head spin!".

as subject for removal from this list (without any fix)

in the connectdata structure by a single handler table ptr.