[PATCH] Fix errors when building with Clang on PPC

[Jussi Kivilinna]

On 20.09.2013 00:14, Dmitry Eremin-Solenikov wrote:
> * mpi/longlong.h (add_ssaaaa, sub_ddmmss, count_leading_zeros,
>   umul_ppmm): Do not cast asm output to USItype.
> 

I can push this one, if that's ok(?).

-Jussi