chunked transfer work

The chunked transfer upload never stopped due to a silly add before we checked
for >0!

We now check if the chunked transfer-encoding header has been added "by force"
and if so, we enabled the chunky upload!

FOLLOWLOCATION and CURLOPT_USERPWD.

for freeing single dns cache entries

for storage and retrieval of private data in the curl handle.

ConnectBits where the other bools already are

AGGRESIVE_TEST is also defined, as an addition to MALLOCDEBUG. It doesn't
work for multi interface usage and should only be used with careful
consideration.

size of the uploaded file is unknown.

CURLOPT_CONNECTTIMEOUT was used and provided a fix.

debug wasn't enabled

counter so that the caller needs to decrease that counter when done with
the returned data.

If compiled with MALLOCDEBUG I've added some extra checking that the counter
is decreased before a handle is closed etc.

memory. Avery Fay brought the example code that proved this.

strnequal() when the third argument was strlen(first argument) anyway.
This makes it less prone to errors. (Slightly edited by me)

badly assumed header, or we think that parts of the buffer is a bad header
and the rest is treated as a normal body part

size isn't big enough. For some reason they now return EAGAIN.

Redhat 8 ships with this glibc version.

the new test case 55.

libtool. Otherwise disable it.

otherwise the multi interface gets problems

when given in the curl_easy_setopt() and then parse them all on the first
curl_easy_perform() call instead.