compiler warning fix

Do a better job at determining what test servers *really* need to link against.

getpart implicitly drags in some networking functions, so it needs to be
linked to the networking libraries.

Better separate the library dependencies into those required by libcurl
and those required by other components to avoid forcing unneeded
dependencies into the target objects.

Remove C99isms

Replicate the configure tests that determined that timeval was available.

add debug messages for fopen() failures

add debug messages for fopen() failures

use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

- Duncan Mac-Vicar Prett and Michal Marek reported problems with resetting
CURLOPT_RANGE back to no range on an easy handle when using FTP.

maxdownload is actually -1 for unlimited

use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

compiler warning fix

avoid redefinition of SET_ERRNO()

introduce uppercase macros SOCKERRNO, SET_SOCKERRNO(), ERRNO and SET_ERRNO()
making them available to any source code file which includes "setup.h".

Macro SOCKERRNO / SET_SOCKERRNO() ret

introduce uppercase macros SOCKERRNO, SET_SOCKERRNO(), ERRNO and SET_ERRNO()
making them available to any source code file which includes "setup.h".

Macro SOCKERRNO / SET_SOCKERRNO() returns / sets the *socket-related* errno
(or equivalent) on this platform to hide platform details to code using it.

Macro ERRNO / SET_ERRNO() returns / sets the NOT *socket-related* errno
(or equivalent) on this platform to hide platform details to code using it.

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icc 9.0 when compiling its generated code for its own FD_SET,
FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
So for icc 9.0 we also ignore warnings #1469 and #593.
* 593 warn

icc 9.0 when compiling its generated code for its own FD_SET,
FD_ISSET, and FD_ZERO macros emits warnings #1469 and #593.
So for icc 9.0 we also ignore warnings #1469 and #593.
* 593 warns on "variable __d0 was set but never used"
* 1469 warns on "cc clobber ignored"

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compiler warning fix

Do not define HAVE_GMTIME_R for native Windows builds

Daniel Mirchandani fix to make libcurl build nicely on Winsock
build targets when --disable-verbose is specified.

enabled IPV6 builds.

Added --ftp-ssl-ccc issue.

Don't bother adding a library path of /usr/lib in curl-config --libs

Oops, missing argument separator comma

in debug messages also show error description