sync to release 4.1

sync to release 4.1

SCCS-vsn: old/games.vax/compat/Makefile 4.1
SCCS-vsn: old/games.vax/compat/Readme 4.1
SCCS-vsn: old/games.vax/compat/bcopy.c 4.1
SCCS-vsn: old/games.vax/compat/compat.s 4.1
SCCS-vsn: old/games.vax/compat/defs.h 4.1
SCCS-vsn: old/games.vax/compat/dofloat.c 4.1
SCCS-vsn: old/games.vax/compat/dosig.c 4.1
SCCS-vsn: old/games.vax/compat/memsiz.s 4.1
SCCS-vsn: old/games.vax/compat/rt11.h 4.1
SCCS-vsn: old/games.vax/compat/runcompat.c 4.1
SCCS-vsn: old/games.vax/compat/unix6sys.h 4.1
SCCS-vsn: old/games.vax/compat/unix6sysn.h 4.1
SCCS-vsn: old/games.vax/compat/unix7sys.h 4.1
SCCS-vsn: old/games.vax/compat/unix7sysn.h 4.1
SCCS-vsn: old/games.vax/compat/unixemts.c 4.1
SCCS-vsn: old/games.vax/compat/unixhdr.h 4.1
SCCS-vsn: old/games.vax/compat/unixstart.c 4.1
SCCS-vsn: old/games.vax/compat/unixtraps.c 4.1
SCCS-vsn: old/games.vax/compat/v6run.1 4.1