update error messages (mostly from sun!guy)

update error messages (mostly from sun!guy)

SCCS-vsn: lib/libc/sys/access.2 6.4
SCCS-vsn: lib/libc/sys/chmod.2 6.3
SCCS-vsn: lib/libc/sys/chown.2 6.4
SCCS-vsn: lib/libc/sys/fork.2 6.2
SCCS-vsn: lib/libc/sys/link.2 6.3
SCCS-vsn: lib/libc/sys/open.2 6.3
SCCS-vsn: lib/libc/sys/ptrace.2 6.3
SCCS-vsn: lib/libc/sys/read.2 6.3
SCCS-vsn: lib/libc/sys/write.2 6.3
SCCS-vsn: lib/libc/sys/execve.2 6.4
SCCS-vsn: lib/libc/sys/acct.2 6.3
SCCS-vsn: lib/libc/sys/chdir.2 6.3
SCCS-vsn: lib/libc/compat-43/creat.2 6.4
SCCS-vsn: lib/libc/sys/mknod.2 6.3
SCCS-vsn: lib/libc/sys/mount.2 6.3
SCCS-vsn: lib/libc/sys/pipe.2 6.2
SCCS-vsn: lib/libc/sys/stat.2 6.4
SCCS-vsn: lib/libc/sys/intro.2 6.4
SCCS-vsn: lib/libc/sys/utimes.2 6.4
SCCS-vsn: lib/libc/sys/gettimeofday.2 6.5
SCCS-vsn: lib/libc/sys/getrusage.2 6.3
SCCS-vsn: lib/libc/sys/swapon.2 6.3
SCCS-vsn: lib/libc/sys/chroot.2 6.3
SCCS-vsn: lib/libc/sys/fsync.2 6.3
SCCS-vsn: lib/libc/sys/getpgrp.2 6.3
SCCS-vsn: lib/libc/gen/gethostname.3 6.2
SCCS-vsn: lib/libc/sys/getitimer.2 6.2
SCCS-vsn: lib/libc/sys/getsockopt.2 6.2
SCCS-vsn: lib/libc/sys/mkdir.2 6.4
SCCS-vsn: lib/libc/sys/readlink.2 6.4
SCCS-vsn: lib/libc/sys/rename.2 6.3
SCCS-vsn: lib/libc/sys/rmdir.2 6.3
SCCS-vsn: lib/libc/sys/symlink.2 6.3
SCCS-vsn: lib/libc/sys/truncate.2 6.4