[patch] Fix FFTW3 macro checks

[Jules Bergmann]

The FFTW_HAVE_{*} variables are either set to 1 or left undefined. 
However, they were being checked with an "#if", which caused an error 
when left undefined.  This patch changes the guard to #ifdef instead.

Since I twisted Stefan's arm :) into keeping the PROVIDE_FFT_{*} macros 
set to either 1 or 0, I just want to make sure this looks OK.

Ok to apply?

				-- Jules

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