for tarball-based tests and builds, the maketgz script inserts it when
the tarball is created. For CVS-based tests and builds the timestamp we
show is the current UTC build time as it is the CVS version timestamp.

In this way, all builds will have a valid source code timestamp which
isn't related to the moment the tests and build is performed, with the
exception of CVS-based ones which have the same "date" and "timestamp"

AC_PATH_PROG was not used properly.

  when the multi interface was used.

  5).

  the multi interface and connection re-use that could make a
  curl_multi_remove_handle() ruin a pointer in another handle.

  The second problem was less of an actual problem but more of minor quirk:
  the re-using of connections wasn't properly checking if the connection was
  marked for closure.

linked to the networking libraries.

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

  CURLOPT_RANGE back to no range on an easy handle when using FTP.

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.

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"