SH multilib removal possibility "-m1 -ml" & "-m2 -ml"

[Joern Rennecke]

tm wrote:
> 
> 
> I've talked to some people, and evidently the SH1 and SH2 do not support
> little-endian. The processors are hardwired for big-endian only.
> 
> Can we remove the multilib configurations for these to improve build times
> for the other SH targets?

That would be MULTILIB_EXCEPTIONS = ml/m1 ml/m2 .
However, I think we can't get rid of the ml/m2 multilib that easily,
since the -m2 libraries are also used by the -m3 and -m4-nofpu options.