[patch] Fast path for FFT

[Jules Bergmann]

This patch adds a fast path for 1-dim, CC FFTs with unit-stride data. 
The fast path uses compiled-time Ext_data instead of Rt_ext_data for a 
marginal performance improvement.

To determine whether the backend will work with the fastpath (in 
particular, whether it supports split- or interleaved- complex), it is 
queried when the workspace is created.

				-- Jules

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