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(obtain_lock): New proc.
(release_lock): New proc.
(l2g_start): Get the lock.
(l2g_stop): Release it.
(lyskomd_start): Get the lock.
(lyskomd_fail_start): Get and release the lock.
(lyskomd_death): Release it.
(client_start_fail): Get and release the lock

[!HAVE_SOCKLEN_T]: Add typedef for socklen_t.

Provide a replacement for inet_aton for systems that only have
inet_addr.  Avoid a warning about memset.

from FD_ZERO on some platforms.

(isc_mkudpaddress): Use inet_aton instead of inet_addr.

	to socklen_t, not pointer to int.
(isc_mktcpaddress): Use inet_aton instead of inet_addr.

(isc_getraddress): Ditto.

for INADDR_NONE only if inet_aton isn't available.

	is what aux_item_list_add_items() wants it to be.

apparently including volatile in sig_atomic_t.

configure instead.

(isc_getipnum): Use it, to get rid of a warning.
(isc_gethostname): Ditto.
(isc_getportnum): Ditto.
(isc_getservice): Ditto.

Make Xenofarm ignore a few warnings in code that we didn't write.

	compiler warnings.

	the wrong type was used.