riscv64 binutils 'support'
Enable just enough of binutils to be a functional compilation system
with llvm doing the heavy lifting.
With corrections suggested by reviewers.
ok jsg@ kettenis@

Stub out aarch64 support and avoid building gas and ld on this architecture.

ok mpi@, patrick@

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and g

Here comes the easter bunnytils 2.17 (the last version released against a
licence mere mortals can understand the terms of); will be connected to the
build on an arch-by-arch basis.

Testsuites and generated files have been intentionnaly omitted from this import.

Peer pressure and ok from at least drahn@ pirofti@ deraadt@

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