The var %MAKEFLAGS is only set in 3 cases: if set as environment
var or as macro definition from commandline, and either with the
-u or -ms switch. Since all these cases are unlikely for the average
user it should be safe to only test if %MAKEFLAGS is defined; this
has the benefit that now all other switches can be used again in
addition to the -u which was formerly not possible.

Curl_llist_init is never used outside of llist.c and thus it should be
static. I also removed the protos for Curl_llist_insert_prev and
Curl_llist_remove_next which are functions we removed from llist.c ages
ago.

Test 563 is enabled now and verifies that the combo FTP type=A URL,
CURLOPT_PORT set and proxy work fine. As a bonus I managed to remove the
somewhat odd FTP check in parse_remote_port() and instead converted it
to a better and more generic 'slash_removed' struct field. Checking the
->protocol field isn't right since when an FTP:// URL is sent over a
HTTP proxy, the protocol is HTTP but the URL was handled by the FTP code
and thus slash_removed is set TRUE for this case.

The struct used for storing the message for a completed transfer is now
no longer allocated separatly but is kept within the main struct kept
for each easy handle so that we avoid one malloc (and the subsequent
free).

In some places where the name 'stream' has been used for naming a
function argument that is in fact settable with a setopt() option we now
call that argument 'userdata' to make it more obvious that it is in fact
possible to set by the application.

Suggested by: Jeff Pohlmeyer

When libcurl internally decided to wait for a 100-continue header, there
was no call to the timeout function so there was no timeout callback
called when the multi_socket API was used and thus applications became
either completely wrong or at least ineffecient depending on how they
handled the situation. We now set a timeout to get triggered.

Reported by: Ben Darnell
Bug: http://curl.haxx.se/bug/view.cgi?id=3039744

For now removed the .autodepend directive until I've figured out
which of my changes broke it again.

libssh2 1.2.6 and later handle >32bit file sizes properly even on 32bit
architectures and we make sure to use that ability.

Reported by: Mikael Johansson
Bug: http://curl.haxx.se/mail/lib-2010-08/0052.html

I added all OBJECTPOINT curl_easy_setopt() options from 178 to 202. Left
to add: the five FUNCTIONPOINT (callbacks) options added since:

SSH_KEYFUNCTION
INTERLEAVEFUNCTION
CHUNK_BGN_FUNCTION
CHUNK_END_FUNCTION
FNMATCH_FUNCTION

Simply because the TCP might be connected already we cannot skip the
proxy connect procedure. We need to be careful to not overload more
meaning to the bits.tcpconnect field like this.

With this fix, SOCKS proxies work again when the multi interface is
used. I believe this regression was added with commit 4b351d01,
released as 7.20.1.

Left todo: add a test case that verifies this functionality that
prevents us from breaking it again in the future!

Reported by: Robin Cornelius
Bug: http://curl.haxx.se/bug/view.cgi?id=3033966

This is only to avoid warnings on some systems.

There is an implicit conversion from "unsigned long" to "long";
rounding, sign extension, or loss of accuracy may result.