Log Message:
Update fftwf to 3.3.4, to match fftw.

FFTW 3.3.4

* New functions fftw_alignment_of (to check whether two arrays are
  equally aligned for the purposes of applying a plan) and fftw_sprint_plan
  (to output a description of plan to a string).

* Bugfix in fftw-wisdom-to-conf; thanks to Florian Oppermann for the
  bug report.

* Fixed manual to work with texinfo-5.

* Increased timing interval on x86_64 to reduce timing errors.

* Default to Win32 threads, not pthreads, if both are present.

* Various build-script fixes.

FFTW 3.3.3

* Fix deadlock bug in MPI transforms (thanks to Michael Pippig for the
  bug report and patch, and to Graham Dennis for the bug report).

* Use 128-bit ARM NEON instructions instead of 64-bits.  This change
  appears to speed up even ARM processors with a 64-bit NEON pipe.

* Speed improvements for single-precision AVX.

* Speed up planner on machines without "official" cycle counters, such \ 
as ARM.