Remove obsolete Solaris 9 support

[Eric Botcazou]

> * Eric: In libgcc/config/sparc/sol2-unwind.h, I've removed the Solaris 9
>   cases after verifying that the cuh_pattern's used there only occur in
>   Solaris 9 (from FCS to the latest libthread.so.1 patch), but not even
>   in Solaris 10 FCS.
> 
>   For Solaris 10, do you have any more details on when the 2-frame case
>   occurs?  I've found that patch submission
> 
> 	http://gcc.gnu.org/ml/gcc-patches/2010-10/msg02370.html
> 
>   but no details on what S10 update/patch this happens with.

Let's not touch libgcc/config/sparc/sol2-unwind.h, the small gain is not worth 
the potential trouble IMO.

-- 
Eric Botcazou