Bring in some work from FreeBSD:

Bring in some work from FreeBSD:

sbin/dump/dump.h      1.7.6.5
sbin/dump/itime.c     1.3.2.2

    do not dump core in -W if dumpdates was not readable and
    ddatev == NULL; remove unused ddates_in.

sbin/dump/traverse.c  1.10.2.7, 1.10.2.8

    Files in subdirectories of directories that have the
    nodump flag set are sometimes incorrectly being dumped.

    Correct a problem with propagation of the nodump flag
    on directories that are larger than one block in size.

Submitted-by: Sepherosa Ziehau <sepherosa@softhome.net>
Taken-from: FreeBSD