[vsipl++] patch: Fix bug in configure.ac that caused VSIP_IMPL_FFTW3 not always to be defined as requested

[Jules Bergmann]

Stefan Seefeld wrote:
> Just what the subject implies. The variables are defined if either
> 'fftw3' or 'builtin' backend is selected.
> 
> Ok, to checkin ?

Looks good to me. -- Jules

-- 
Jules Bergmann
CodeSourcery
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