require fftw 3.3.9 and use planner_nthreads in finufft.cpp #521
Description
Line 764 in cdcccbe
rewrite that fftw plan call using fftw_planner_nthreads.
See https://www.fftw.org/release-notes.html
3.3.9 was released Dec 2020.
Julia crash may be related to this:
ludvigak/FINUFFT.jl#61