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Add compiler option for FFT strategy

Timothy Davies requested to merge tdavies__add_option_for_fft_strategy into spiir_compatibility_fixes

I've tried setting the FFT strategy based on a compiler flag. We want 0 (FFTW_ESTIMATE) for deterministic test results. 1 is FFTW_MEASURE, the same default as before.

See lscsoft/spiir!20 (merged)

I've been able to build with CFLAGS=-DFFTW_MEASURE_LEVEL=0\ $CFLAGS (pretty sure I've done that right... should it just be in quotes instead of escaping the space?)

Edited by Timothy Davies

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