mtree(5) and mtree(8) come from different contrib sources. The former
already had an xref to the latter, but not the other way around.
MFC after: 1 week
This version of mtree implements a new flag (-O) that can be used to
restrict the tool to certain pathnames. Also, it fixes a compiler
warning generated by -Wmissing-variable-declarations.
Acked by: brooks
towards replacing our mtree.
Sponsored by: DARPA, AFRL
Thanks to: cristos@NetBSD for reviewing and committing my patches
wiz@NetBSD for fixing typos in my patches
