[vsipl++] [patch] Fixes for building benchmarks with IPP (and MPI)

[Don McCoy]

Jules Bergmann wrote:
> Since VSIP_IMPL_MPI_H is used here as a boolean (1 if MPI is present), 
> and is used elsewhere as the name of the MPI header file, can you call 
> it something else to avoid confusion -- for example VSIP_IMPL_MPI or 
> VSIP_IMPL_HAVE_MPI?
Done.  Checked in.

-- 
Don McCoy
don (at) CodeSourcery 
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