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

[MacPorts]

#57912: OpenBLAS compilation fails on iMac Pro MacOS 10.13
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  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 agree that there is indeed nothing wrong with the fact of enabling
 AVX512 in general.

 However, there is a practical difference in the sense that AVX2 can be
 fixed when cctools +xcode is enabled, while AVX512 cannot.

 Furthermore, it is a fact that there have been multiple commits upstream
 in the past few days to fix and refine AVX512 use and detection.

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Ticket URL: <https://trac.macports.org/ticket/57912#comment:25>
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