* minor new port: ia64-hp-hpux11.23

* minor new port: ia64-hp-hpux11.23

* m4/macros/check_libwrap_severity.m4 (LIBS): also test if caller
needs to define rfc931_timeout.

* amd/sun2amd.c: define rfc931_timeout and allow/deny_severity for
libwrap.

* amd/amq_svc.c: some versions of libwrap require the caller to
define rfc931_timeout in addition to allow/deny_severity.

* amd/amfs_toplvl.c (amfs_toplvl_init): properly detect when
forced unmount functionality exists for all systems.

* libamu/mount_fs.c (compute_nfs_args): reset nfs_args_t->pathconf
only if field exists.

* conf/nfs_prot/nfs_prot_hpux11.h: prevent HPUX 11.23 from
including <tiuser> or <sys/tiuser> (TLI definitions are already
included from elsewhere).

* configure.in: detect nfs_args_t->pathconf field.