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"

macro to provide this functionality on all platforms

provide a suitable replacement for use in our ISBLANK macro

DNS from /etc/nsswitch.conf, /etc/host.conf or /etc/svc.conf when
/etc/resolv.conf did not exist or was unable to read it.

*) Update CURL_CC_DEBUG_OPTS from curl's script

Include <process.h> for getpid() in ares_init.c.

Added 'optind' and 'optarg' as in adig.c.

<sys/time.h>.

as appropriate for platforms that don't have autotools support

struct, and there are domain/search entries in /etc/resolv.conf, the domains
of the options struct will be overridden.