Use tvnow() and tvdiff() to avoid introducing new linkage issues

Also, use memset() instead of a lame loop.

The previous logic that tried to avoid too many updates were very
ineffective for really fast transfers, as then it could easily end up
doing hundreds of updates per second that would make a significant
impact in transfer performance!

Bug: http://curl.haxx.se/mail/archive-2013-07/0031.html
Reported-by: Marc Doughty

(This doesn't need to appear in the release notes.) I noticed a few places
where infof() was called, and there should've been an LF at the end of the
string, but there wasn't.

It turns out Snow Leopard not only has SecItemCopyMatching() defined in
a header not included by the omnibus header, but it won't work for our
purposes, because searching for SecIdentityRef objects wasn't added
to that API until Lion. So we now use the old SecKeychainSearch API
instead if the user is building under, or running under, Snow Leopard.

Bug: http://sourceforge.net/p/curl/bugs/1255/
Reported by: Edward Rudd

Previously we used __MAC_10_X and __IPHONE_X to mark digest-generating
code that was specific to OS X and iOS. Now we use
__MAC_OS_X_VERSION_MAX_ALLOWED and __IPHONE_OS_VERSION_MAX_ALLOWED
instead of those macros.

Bug: http://sourceforge.net/p/curl/bugs/1255/
Reported by: Edward Rudd

When the multi-socket API is used, we need the handle to be checked
again when it gets unpaused.

Bug: http://curl.haxx.se/mail/lib-2013-07/0239.html
Reported-by: Justin Karneges

For the standard VMS text file formats, VMS needs to read the file to
get the actual file size.

For the standard VMS binary file formats, VMS needs a special format of
fopen() call so that it stops reading at the logical end of file instead
of at the end of the blocks allocated to the file.

I structured the patch this way as I was not sure about changing the
structures or parameters to the routines, but would prefer to only call
the stat() function once and pass the information to where the fopen()
call is made.

Bug: https://sourceforge.net/p/curl/bugs/758/

The code for CURLFORM_FILECONTENT had its check for duplicate options
wrong so that it would reject CURLFORM_PTRNAME if used in combination
with it (but not CURLFORM_COPYNAME)! The flags field used for this
purpose cannot be interpreted that broadly.

Bug: http://curl.haxx.se/mail/lib-2013-07/0258.html
Reported-by: Byrial Jensen

Linking on Solaris 10 x86 with Sun Studio 12 failed when we upgraded
automake for the release builds.

Bug: http://curl.haxx.se/bug/view.cgi?id=1217
Reported-by: Dagobert Michelsen

Previously the path was cleaned, but the URL wasn't properly updated.

In the reorganization of the build_vms.com the debug and float options
were not fixed up correctly.

Two fixes:

1. Force output file format to be stream-lf so that partial downloads
can be continued.

This should have minor impact as if the file does not exist, it was
created with stream-lf format.  The only time this was an issue is if
there was already an existing file with a different format.

2. Fix file uploads are now fixed.

   a. VMS binary files such as ZIP archives are now uploaded
      correctly.

   b. VMS text files are read once to get the correct size
      and then converted to line-feed terminated records as
      they are read into curl.

The default VMS text formats do not contain either line-feed or
carriage-return terminated records.  Those delimiters are added by the
operating system file read calls if the application requests them.

Bug: http://curl.haxx.se/bug/view.cgi?id=496

We no longer pass our 'bool' data type variables nor constants as
an argument to my_setopt(), instead we use proper 1L or 0L values.

This also fixes macro used to pass string argument for CURLOPT_SSLCERT,
CURLOPT_SSLKEY and CURLOPT_EGDSOCKET using my_setopt_str() instead of
my_setopt().

This also casts enum or int argument data types to long when passed to
my_setopt_enum().

Commit 6d30f8eb didn't work properly. First, it used the wrong
array index, but this fix also:

1 - only does the copying if indeed there was any activity

2 - makes sure to properly translate between internal and external
bitfields, which are not guaranteed to match

Reported-by: Evgeny Turnaev

Instead of going 50,100,150 etc millisecond delay time when nothing has
been found to do or wait for, we now start lower and double each loop as
in 4,8,16,32 etc.

This lowers the minimum wait without sacrifizing the longer wait too
much with unnecessary CPU cycles burnt.

Bug: http://curl.haxx.se/mail/lib-2013-07/0103.html
Reported-by: Andreas Malzahn

In the case of an active connection when ftp_do_more() detects that the
server has connected back, it must make sure to mark it as complete so
that the multi_runsingle() function will detect this and move on to the
next state.

Bug: http://curl.haxx.se/mail/lib-2013-07/0115.html
Reported-by: Clemens Gruber

CURLOPT_XFERINFOFUNCTION is now the preferred progress callback function
and CURLOPT_PROGRESSFUNCTION is considered deprecated.

This new callback uses pure 'curl_off_t' arguments to pass on full
resolution sizes. It otherwise retains the same characteristics: the
same call rate, the same meanings for the arguments and the return code
is used the same way.

The progressfunc.c example is updated to show how to use the new
callback for newer libcurls while supporting the older one if built with
an older libcurl or even built with a newer libcurl while running with
an older.

This reverts commit 7ed25ccf, reinstating commit 8ec2cb55.

As of 18-jul-2013 we still do have code in libcurl that makes use of these
memory functions. Commit 8ec2cb55 comment still applies and is yet valid.

These memory functions are solely used in Windows builds, so all related
code is protected with '#ifdef WIN32' preprocessor conditional compilation
directives.

Specifically, wcsdup() _wcsdup() are used when building a Windows target with
UNICODE and USE_WINDOWS_SSPI preprocessor symbols defined. This is the case
when building a Windows UNICODE target with Windows native SSL/TLS support
enabled.

Realizing that wcsdup() _wcsdup() are used is a bit tricky given that usage
of these is hidden behind _tcsdup() which is MS way of dealing with code
that must tolerate UNICODE and non-UNICODE compilation. Additionally, MS
header files and those compatible from other compilers use this preprocessor
conditional compilation directive ...