4.4BSD snapshot (revision 8.1); add 1993 to copyright

4.4BSD snapshot (revision 8.1); add 1993 to copyright

SCCS-vsn: sys/hp300/hp300/autoconf.c 8.1
SCCS-vsn: sys/hp300/hp300/clock.c 8.1
SCCS-vsn: sys/hp300/hp300/clockioctl.h 8.1
SCCS-vsn: sys/hp300/hp300/clockreg.h 8.1
SCCS-vsn: sys/hp300/hp300/conf.c 8.1
SCCS-vsn: sys/hp300/hp300/dkbad.c 8.1
SCCS-vsn: sys/hp300/hp300/genassym.c 8.1
SCCS-vsn: sys/hp300/hp300/in_cksum.c 8.1
SCCS-vsn: sys/hp300/hp300/isr.h 8.1
SCCS-vsn: sys/hp300/hp300/kgdb_glue.c 8.1
SCCS-vsn: sys/hp300/hp300/kgdb_proto.h 8.1
SCCS-vsn: sys/hp300/hp300/kgdb_stub.c 8.1
SCCS-vsn: sys/hp300/hp300/led.h 8.1
SCCS-vsn: sys/hp300/hp300/machdep.c 8.1
SCCS-vsn: sys/hp300/hp300/locore.s 8.1
SCCS-vsn: sys/hp300/hp300/mem.c 8.1
SCCS-vsn: sys/hp300/hp300/pmap.c 8.1
SCCS-vsn: sys/hp300/hp300/pmap_bootstrap.c 8.1
SCCS-vsn: sys/hp300/hp300/pte.h 8.1
SCCS-vsn: sys/hp300/hp300/swapgeneric.c 8.1
SCCS-vsn: sys/hp300/hp300/sys_machdep.c 8.1
SCCS-vsn: sys/hp300/hp300/trap.c 8.1
SCCS-vsn: sys/hp300/hp300/vm_machdep.c 8.1
SCCS-vsn: sys/hp300/hp300/oc_cksum.s 7.3