K 10
svn:author
V 4
ngie
K 8
svn:date
V 27
2019-02-06T21:24:44.943286Z
K 7
svn:log
V 579
Clean up all directories created by `make hier`

The logic I introduced in r322511 unfortunately left chflags schg'ed
directories behind created by `make hier` (in the stock /etc/mtree
files, this is limited to /var/empty).

The proposed change calls `chflags -R 0` and `rm -Rf ...` to clean all
of the directories that could not be removed by `${MAKE} clean`.
`${MAKE} clean` in bsd.obj.mk calls `cleandir`/`cleanobj`, which handles
the first directory tree walk/removal.

Approved by:	emaste (mentor)
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D18641

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