* fix -j N parallel build issues
* support MAKEVERBOSE
* move NOxxx= to before <bsd.own.mk>
* remove unnecessary -ll (except for ipsend)
* remove unnecessary CPPFLAGS
* only build libipf.a (we don't need libipf_p.a or libipf_pic.a)
* fix dependencies upon libipf.a
(more could be done, but that requires fixing dist/ipf/*)