fftw: Adapt use of SIMD instructions of intel and powerpcs.
fftw: Adapt use of SIMD instructions of intel and powerpcs.

Signed-off-by: Rogério Brito <f021e3c6d091521976e4c271deb1e33b334373a1@ime.usp.br>

ahihi/tigerbrew,ahihi/tigerbrew,ahihi/tigerbrew,ahihi/tigerbrew