[MacPorts] #61700: OpenBlas fails to build on macOS BigSur (Apple Silicon)

[MacPorts]

#61700: OpenBlas fails to build on macOS BigSur (Apple Silicon)
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  Reporter:  Gregory-Gelfond  |      Owner:  NicosPavlov
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:  arm64
      Port:  openblas         |
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Comment (by jmroot):

 The attached patch should be a start at least. It should also be safe to
 commit as long as the `set blas_arch "???"` is not uncommented. At
 minimum, someone needs to figure out the correct arch name to use there,
 and of course test it.

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Ticket URL: <https://trac.macports.org/ticket/61700#comment:6>
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