cmake EL_HAVE_ACCELERATE examples

elemental/Elemental cmake/external_projects/ElMath/ScaLAPACK.cmake :244 

elseif(EL_HAVE_ACCELERATE AND 
         NOT EL_PREFER_OPENBLAS AND NOT EL_PREFER_BLIS_LAPACK)

elemental/Elemental cmake/external_projects/ElMath/ScaLAPACK.cmake :340 

elseif(EL_HAVE_ACCELERATE AND
         NOT EL_PREFER_OPENBLAS AND NOT EL_PREFER_BLIS_LAPACK)