configure.ac:1349: error: possibly undefined macro: PKG_CONFIG_LIBDIR

Obviously this is not a problem with pkg-config 0.26 but older versions
seem to show this.

Fix suggested by: Kamil Dudka
Reported by: Guenter
Bug: http://curl.haxx.se/mail/lib-2011-11/0298.html

"Active FTP hangs if server does not open data connection"

The server first sends a 150 and then when libcurl waits for the data
transfer, the server sends a 425.

The protocol parts for these tests do not include QUIT simply because
the error is CURLE_OPERATION_TIMEDOUT (28) which is a generic timeout
error without specificly saying for which connection it concerns, and
for timeouts libcurl marks the control channel as "invalid". As this
test case times out for the data connection it could still use the
control channel.

Added convenience macro to use to check if a handle is using a shared
SSL session, and fixed so that Curl_ssl_close_all() doesn't lock when
the session isn't shared.

Skip a floating point addition operation when integral part of time difference
is zero. This avoids potential floating point addition rounding problems while
preserving decimal part value.

Macros that look like function calls need to be made so that we can use
semicolons properly for indentation and for reducing the risk for
mistakes when using them.

1) enables the Window Size option
2) allows the server to enable the echo mode
3) allows an app using libcurl to disable the default binary mode

Signed-off-by: Laurent Rabret

By setting PROTOPT_NOURLQUERY in the protocol handler struct, the
protocol will get the "query part" of the URL cut off before the data is
handled by the protocol-specific code. This makes libcurl adhere to
RFC3986 section 2.2.

Test 1220 is added to verify a file:// URL with query-part.

Experience has shown that the symbols-in-versions file is very useful to
applications that want to build with a wide range of libcurl versions.
It is however easy to get it wrong and the source gets a bit messy with
all the fixed numerical comparisions.

The point of this script is to provide an easy-to-use macro for libcurl-
using applications to do preprocessor checks for specific libcurl
defines, and yet make the code clearly show what the macro is used for.

Bugfix: https handshake fails using gnutls 3 on windows
http://sourceforge.net/tracker/index.php?func=detail&aid=3441084&group_id=976&atid=100976

New gnutls versions have an error handler that knows about Winsock
errors, which is why gnutls_transport_set_global_errno() was deprecated
and then removed.

This is a correction of commit f5bb3701 (blame me) which meant to
reimplement gnutls_transport_set_global_errno(), which is not necessary.

Regression: commit b998d95b (shipped first in release 7.22.0) made the
condition always equal false that should reset the TIMER_CONNECT timer
and call the Curl_verboseconnect() function.

Reported by: "Captain Basil"
Bug: http://curl.haxx.se/mail/archive-2011-11/0035.html

A regression between 7.22.0 and 7.23.0 -- downloading a file with the
flags -O and -J results in the content being written to stdout if and
only if there was no Content-Disposition header in the http response. If
there is a C-D header with a filename attribute, the output is correctly
written.

Reported by: Dave Reisner
Bug: http://curl.haxx.se/mail/archive-2011-11/0030.html

Related to the f64812ca commit

prefixing a command with '*' means it is allowed to fail without
aborting the chain actions

Also, check for the session sharing bit instead of comparing pointers

Previously the age counter would be counted individually in each easy
handle that shared SSL sessions!

Bug: http://curl.haxx.se/mail/lib-2011-11/0180.html
Reported by: Mark Brand

one more bug fix and contributor

The progress bar output function would blindly use the terminal width
without bounds checking. When using a very wide terminal that caused a
buffer overflow and segfault.

We now limit the max bar with to 255 columns, and I simplified the code
to avoid an extra snprintf and buffer.

Bug: http://curl.haxx.se/bug/view.cgi?id=3435710
Reported by: Alexey Zakhlestin

591 -> FTP multi PORT and 425 on upload
592 -> FTP multi PORT and 421 on upload
593 -> FTP multi PORT upload, no data conn and no transient neg. reply
594 -> FTP multi PORT upload, no data conn and no positive prelim. reply

1206 -> FTP PORT and 425 on download
1207 -> FTP PORT and 421 on download
1208 -> FTP PORT download, no data conn and no transient negative reply
1209 -> FTP PORT download, no data conn and no positive preliminary reply