This prevents libpcap's Makefile.depend from flip-flopping when OFED is
enabled.
Sponsored by : Juniper Networks, Inc.
MFC after: 7 days
Reviewed by: sjg
Differential Revision: https://reviews.freebsd.org/D42649
Leaf directories that have dependencies impacted
by options need a Makefile.depend.options file
to avoid churn in Makefile.depend
DIRDEPS for cases such as OPENSSL, TCP_WRAPPERS etc
can be set in local.dirdeps-options.mk
which can add to those set in Makefile.depend.options
See share/mk/dirdeps-options.mk
Reviewed by: bdrewery
MFC after: 1 week
Sponsored by: Juniper Networks
Differential Revision: https://reviews.freebsd.org/D22469