[patch] Misc fixes

[Jules Bergmann]

This patch
  - disable FFTW split-complex altogether.  Out-of-place complex split 
FFT appears broken on belgarath.
  - Fixes ifdef logic bug that prevented optimized convolution BEs from 
being used.
  - Adds a 2D conv benchmark

Patch applied.

				-- Jules

-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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