sc-im marked broken on aarch64

[Iku]

> fwiw, my goal in marking ports BROKEN on the various tier-2 archs is to
> bring more attention to them.  We still have a lot of work to do on the
> arm archs in particular to bring things up to parity with amd64 (well,
> as much as we can, in any case.)  All help is welcome!

 I might take a stab at some of those once I get some hardware in.

Thanks for helping out with this one.