...which was accidentally introduced in commit 4d6ef629.

URL: http://curl.haxx.se/bug/view.cgi?id=1279
Suggested-by: Jerry Krinock

Commit 32352ed6 introduced various DNS options, however, these
would cause curl to exit with CURLE_NOT_BUILT_IN when c-ares wasn't
being used as the backend resolver even if the options weren't set
by the user.

Additionally corrected some minor coding style errors from the same
commit.

URL: http://curl.haxx.se/bug/view.cgi?id=1278
Reported-by: Gorilla Maguila

(Passed on to c-ares.)

Allows something like this:

curl --dns-interface sta8 --dns-ipv4-addr 8.8.1.111 --interface sta8 \
--localaddr 8.8.1.111 --dns-servers 8.8.8.1 www.google.com

Signed-off-by: Ben Greear <greearb@candelatech.com>

... and a few more cleanups/clarifications

Global symbol "$mailbox" requires explicit package name

...as this will be required for IMAP CLOSE and EXPUNGE commands as well
as the POP3 RSET command.

Solaris with the SunStudio Compiler is reportedly missing this define,
but as we're using it without any good reason on all the places it was
used I've now instead switched to just use sensible buffer sizes that
fit a 32 bit decimal number. Which also happens to be smaller than the
common NI_MAXSERV value which is 32 on most machines.

Bug: http://curl.haxx.se/bug/view.cgi?id=1277
Reported-by: D.Flinkmann

... instead of HTTP/2.0 to work fine with the nghttpx proxy/server.

warning: comparison between signed and unsigned integer expressions

Don't wait for the next callback call (usually 1 second) before
continuing with protocol specific connection initialization.

This function was modified in nghttp2 git commit a1c3f89c72e51

Otherwise, the FTP protocol would unnecessarily hang 60 seconds if
aborted in the CURLOPT_HEADERFUNCTION callback.

Reported by: Tomas Mlcoch
Bug: https://bugzilla.redhat.com/1005686

Make sure that the custom struct fields are only used by code that
doesn't use a struct defintion from the outside.

Attempts to fix the problem introduced in 3dc6fc42

Otherwise the connection can get stuck during various phases, waiting
for new data on the socket using select() etc., but it will never be
received as the data has already been read into SSL library.

The transfer size would be calculated incorrectly if the email contained
within the FETCH response, had been partially received by the pingpong
layer. As such the following, example output, would be seen if the
amount remaining was smaller than the amount received:

* Excess found in a non pipelined read: excess = 1394, size = 262,
  maxdownload = 262, bytecount = 1374
* transfer closed with -1112 bytes remaining to read

Bug: http://curl.haxx.se/mail/lib-2013-08/0170.html
Reported-by: John Dunn

...from commits 28427b40 and e8313697.