Several fixes. The big one is that all of the

Several fixes.  The big one is that all of the
code that was "#if defined(ENCRYPTION)" is now changed
to "#ifdef ENCRYPTION", so that all the encryption code
can be stripped out using unifdef.
Other fixes:
Add support for HP-UX (untested...)
Simplification of the ENV_HACK stuff
Add in UNICOS 8.0 secure system changes
Clean up the option processing
Fix up the usage() statement

SCCS-vsn: libexec/telnetd/authenc.c 5.3
SCCS-vsn: libexec/telnetd/telnetd.c 5.52
SCCS-vsn: libexec/telnetd/termstat.c 5.14
SCCS-vsn: libexec/telnetd/utility.c 5.12
SCCS-vsn: libexec/telnetd/defs.h 5.12
SCCS-vsn: libexec/telnetd/state.c 5.14
SCCS-vsn: libexec/telnetd/sys_term.c 5.22
SCCS-vsn: libexec/telnetd/ext.h 5.10