[Bug 221633] math/openblas: update to 0.2.20

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221633

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: truckman
Date: Fri Aug 25 19:58:51 UTC 2017
New revision: 448738
URL: https://svnweb.freebsd.org/changeset/ports/448738

Log:
  Upgrade OpenBLAS to 0.2.20:

   * Fixed several thread race and locking bugs

   * Fixed default LAPACK optimization level

   * Updated LAPACK to 3.7.0

   * Power
     - Optimizations for Power9
     - Fixed several Power8 assembly bugs

   * ARM
     - New optimized Vulcan and ThunderX2T99 targets
     - Support for ARMV7 SOFT_FP ABI  (make ARM_SOFTFP_ABI=1)
     - Detect all cpu cores including offline ones
     - Fix compilation with CLANG

   * MIPS
     - Fixed several threading issues
     - Fix compilation with CLANG

   * x86_64
     - Detect Intel Bay Trail and Apollo Lake
     - Detect Intel Sky Lake and Kaby Lake
     - Detect Intel Knights Landing
     - Detect AMD A8, A10, A12 and Ryzen
     - Fix cmake builds for Haswell and related cpus
     - Fix building for Sandybridge with CLANG 3.9

  Pet portlint (USES vs. USE)

  PR:           221633
  Submitted by: truckman
  Approved by:  phd_kimberlite at yahoo.co.jp (maintainer)

Changes:
  head/math/openblas/Makefile
  head/math/openblas/distinfo
  head/math/openblas/files/patch-common__arm.h
  head/math/openblas/files/patch-driver_others_blas__server.c

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