[MacPorts] #57912: OpenBLAS compilation fails on iMac Pro MacOS 10.13

[MacPorts]

#57912: OpenBLAS compilation fails on iMac Pro MacOS 10.13
-------------------------+-------------------------
  Reporter:  EJFielding  |      Owner:  NicosPavlov
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:  OpenBLAS    |
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Comment (by NicosPavlov):

 I temporarily deactivated AVX512 in OpenBLAS, to allow for a version to
 build and not block other ports.

 I however left AVX512 instructions in "openblas-devel" to enable testing,
 and also as changes in the code have been made on that matter upstream. I
 just updated the Portfile to the latest commit.

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Ticket URL: <https://trac.macports.org/ticket/57912#comment:29>
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