Log Message:
sysutils/netbt-hcidump: Fix build using bootstrap bmake.

I'm not sure when NetBSD's <bsd.lib.mk> started allowing
LIBISPRIVATE=yes, but we should always be able to build using
bootstrap-mk-files <bsd.lib.mk>.  Adding MKLINKLIB=no MKPIC=no
MKPROFILE=no turns the library into a helper library that is not
installed.