All of the removed code is handled by the FAST_DEPEND code.
A suspicious looking removals are in bsd.prog.mk/bsd.lib.mk but they were
replaced by a OBJS_DEPEND_GUESS variable that bsd.dep.mk now handles
when there is no .depend.<foo.o> file.
I am unsure if I missed more in sys/conf that can come out.
Came in from "aarch64 port sent by C. Bergstrom"
http://llvm.org/viewvc/llvm-project?view=revision&revision=225792
but this just added KMP_AARCH_64 to the existing ARM/X86_64 cases, KMP_OS_LINUX was already there
is there something FreeBSD-aarch64-specific here?