[PATCH, SH] Do not treat plain binary as sh3.

[Takashi Yoshii]

> There were no objections, so I've committed your patch and
> the update of arch_expected.txt with the ChangeLog entries
> below.
Thank you, and sorry for bothering you with extra work.

> A minor nit: the patch should be against the current mainline
> with the corresponding ChangeLog entry.
Thank you again for instruction. I will do better next time.
/yoshii