SO_KEEPALIVE flag to all sockets. Note that several loops which used to continue on a return value
of 0 (theoretical since 0 would never be returned without O_NONBLOCK) now break on 0 so that they
won't continue reading until after poll is called again.

for non-blocking sockets: now -1 means error or connection finished, 1 means data was read, and 0
means there is no data available now so need to wait for poll (new return value)

half-finished.

Note the the req struct used to be re-initialized AFTER reading pipeline data, so now that we
initialize it from the caller we must be careful not to overwrite the pipeline data.

Also we now need to handle the case where the buffer is already full when get_request is called -
previously this never happened as it was always called with an empty buffer and looped until done.

Now get_request is called in a loop, so the next step is to run the loop on a socket only when poll
signals it is readable.

The next step will be to call the correct function after a poll, rather than looping unconditionally

be redundant once we poll

It eliminates noisy events when using inotify and fixes a TOCTOU issue.

Bug: https://bugzilla.redhat.com/844385

Discussion on the list: http://curl.haxx.se/mail/lib-2012-07/0271.html

Removed APOP and SASL authentication from the POP3 section and metalink
support from the client section as these features were implemented in
this release.

Moved adding gssapi to SASL into it's own section rather than repeat it
for each protocol.

Let's call it 7.27.1 for now, but it it probably going to become 7.28.0
when released.

This needs another look from the configure experts. I tested that
it works so far with MinGW64 cross-compiler; libcurl builds and
links fine, but curl not yet ...

The --silent bug came with 7561a0fc which was never in a release.
Pointed out by Kamil Dudka

4 more bugfixes, 3 more contributors

Synced the output to the same short form as we now use for
Windows SSL (WinSSL).

Previously the curl_multi interface would freeze if darwinssl was
enabled and at least one of the handles tried to connect to a Web site
using HTTPS. Removed the "wouldblock" state darwinssl was using because
I figured out a solution for our "would block but in which direction?"
dilemma.

Reported by: Santhana Todatry

DragonFly uses milliseconds, while our API and Linux use full seconds.

Reported by: John Marino
Bug: http://curl.haxx.se/bug/view.cgi?id=3546257

Bug: https://bugzilla.redhat.com/676596

... and orig_isatty which caused --silent to be entirely ignored in case
the standard output was redirected to a file!

The clean-local hook needed some polish to make sure make distclean
works. Added comment describing why.

Previous fix didnt work on Linux ...

Replaced the Windows real path from mount hack with a more
reliable and simpler hack: the MSYS shell has a builtin pwd
which understands a -W option which does convertion to Windows
paths. Tested and confirmed that this works on all MSYS versions
I have back to a 3 year old one.

1) the check for winssl needs to come before nss check
2) the SSL checks must begin with a new if or else we will
never find any SSL lib with MinGW.

This is a MSYS/MinGW-only warning; full warning text is:
Use of uninitialized value in numeric gt (>) at ../../curl/tests/runtests.pl line 2227.