[MacPorts] #65629: SDRangel 7.6.0_0 upgrade failure on OSX 10.13.6

[MacPorts]

#65629: SDRangel 7.6.0_0 upgrade failure on OSX 10.13.6
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  Reporter:  rufty     |      Owner:  ra1nb0w
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  SDRangel  |
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Comment (by ra1nb0w):

 clang 10.0.0 should support c++17 therefore it should have
 {{{aligned_alloc}}}. Maybe forcing macports's clang? just like for
 previous macOS version?

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Ticket URL: <https://trac.macports.org/ticket/65629#comment:3>
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