[Bug 239511] math/fftw3: Add arm64 performance counter and enable neon

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239511

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rakuco
Date: Sun Nov  3 13:11:01 UTC 2019
New revision: 516418
URL: https://svnweb.freebsd.org/changeset/ports/516418

Log:
  Add arm64 performance counter and enable NEON support.

  * Enable cycle counter via the PMCCNTR_EL0 register on arm64 for all variants
  * Enable NEON instructions for -float flavor
  * Runtime tested with bench utility in tests directory
    (./work/fftw-3.3.8/tests/bench if compiling ports) on Orange Pi PC running
    13.0-CURRENT r347967

  PR:           239511
  Submitted by: daniel.engberg.lists at pyret.net
  Reviewed by:  mikael.urankar at gmail.com
  Approved by:  jhale (maintainer timeout, 3 months)

Changes:
  head/math/fftw3/Makefile

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