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.

defining HAVE_SIGNAL_H if the header is available.

Added a check in configure that tests if the sig_atomic_t type is
available, defining HAVE_SIG_ATOMIC_T if it is available. Providing
a suitable default in setup_once.h if not available.

Added a check in configure that tests if the sig_atomic_t type is
already defined as volatile, defining HAVE_SIG_ATOMIC_T_VOLATILE
if it is available and already defined as volatile.