Adding Leon processor to the SPARC list of processors

[Eric Botcazou]

> Yes, if all the people who want only one set of libraries agree on what
> that set shall be (or this can be selected with existing configure flags),
> this is the simplest way.

Yes, this can be selected at configure time with --with-cpu and --with-float.

The default configuration is also straightforward: LEON is an implementation 
of the SPARC-V8 architecture so --with-cpu=v8 and --with-float=hard.

> Also, it might happen that someone doesn't want one multilib dimension, but
> they want to keep another one.

Indeed, being able to partially disable multilibs would be nice.

-- 
Eric Botcazou