patch: enable/disable fftwf, fftw, and fftwl individually

[Stefan Seefeld]

The attached patch probes at configure-time for those three libraries, 
defines VSIP_IMPL_FFTW3_HAVE_{FLOAT, DOUBLE, LONG_DOUBLE} appropriately, 
and then only enables and defines bindings for the available types.

OK to check in ?

Thanks,
		Stefan

-- 
Stefan Seefeld
CodeSourcery
stefan at codesourcery.com
(650) 331-3385 x718
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