Accidentally left in there during my previous debugging of this

In order to avoid for example the pingpong protocols to issue STARTTLS
(or equivalent) even though there's no SSL support built-in.

Reported by: Sune Ahlgren
Bug: http://curl.haxx.se/mail/archive-2010-10/0045.html

Some options, such as the automatic decompression and some SSL related
ones now will bail out if the underlying libcurl doesn't have support
for the particular feature needed.

Reported by: Christian Weisgerber
Bug: http://curl.haxx.se/bug/view.cgi?id=3087479

The option takes a parameter that should be 1 or 0 to enable or disable
the feature.

URL: http://curl.haxx.se/bug/view.cgi?id=3086428

Modified Watcom targets to avoid backslashs so that they can
work on Linux too.

Do not match the trailing '\n' in the regular expression as this would
make us dump a ) parenthesis on a new line.

This fixes the following error:

would get transformed into:

)

Bug: http://curl.haxx.se/mail/lib-2010-10/0065.html
Reported by: Dimitre Dimitrov

If the filename contains a backslash, only use filename portion. The
idea is that even systems that don't handle backslashes as path
separators probably want that path removed for convenience.

This flaw is considered a security problem, see the curl security
vulnerability http://curl.haxx.se/docs/adv_20101013.html

This is similar to how it's done in the lib directory.
The Amiga build appears to have been broken for a year because
of a missing homedir.c

As the change in 5f0ae7a0 added a precaution against negative
file sizes that for some reason managed to get returned, this change now
introduces the same check at the second place in the code where the file
size from the libssh2 stat call is used.

This check might not be suitable for a 32 bit curl_off_t, but libssh2.h
assumes long long to work and to be 64 bit so I believe such a small
curl_off_t will be very unlikely to occur in the wild.

... and some minor source code whitespace edits

Having an open brace without a closing brace caused a segfault.

Having a closing brace too many caused a silent error to occur, which
caused curl to bail out and return an error code but no error message
was shown. It does now!

All error message outputs no longer wrongly get _two_ newlines written
after the error message.

Reported by: Vlad Ureche
Bug: http://curl.haxx.se/bug/view.cgi?id=3083942

The invocation of autoconf's AC_PATH_PROG( ) is not quite right for
finding curl-config. This fix corrects the negative case (where
curl-config is not found).

"261 - configure and libidn" is removed from the list since Julien
Chaffraix tried to repeat it but failed and the reporter did not return
to provide further details.

Reported by: Lyndon Hill
Bug: http://curl.haxx.se/mail/lib-2010-07/0029.html

The macro provides a --with-libcurl option that expects a PREFIX to be
specified and not actually a "directory" in which libcurl will be found.
This now spells that out more clearly.

Reported by: Dan Locks
Bug: http://curl.haxx.se/bug/view.cgi?id=3079891

Renamed SDK_* to NDK_*; made NDK_* defines overwriteable from
environment; removed now obsolete YACC macro;
moved some curl_config.h defines to IPv6 section since they
are only needed when IPv6 is enabled - this makes libcurl compile
with older NDKs too which were not IPv6-aware.

"3076808 Requests fail silently following a 416 error" done

We forgot to release the buffer passed to gss_init_sec_context.

The previous logic was difficult to read as we were reusing the same
variable (gssbuf) for both input buffer and output buffer. Splitted the
logic in 2 variables to better underline who needs to be released.
Also made the code break at 80 lines.

kr5_auth missed a final 'return' statement. This is not an error in
gcc but can lead to potential bugs.

This fixes a memory leak related to the GSS-API code.

Added a krb5_init and krb5_end functions. Also removed a work-around
the lack of proper initialization of the GSS-API context.

It was pointed out that the special case libcurl did for 416 was
incorrect and wrong. 416 is not really different to other errors so the
response body must be handled like for other errors/http responses.

Reported by: Chris Smowton
Bug: http://curl.haxx.se/bug/view.cgi?id=3076808

This delays between write operations, hopefully making it easier
to spot problems where libcurl doesn't flush the socket properly
before waiting for the next response.

The issue named "266 - Bug in ftp_nextconnect?" was deemed to not be a
bug and instead resulted in clarified docs.