[MacPorts] #65795: harfbuzz-icu can't be compiled on 10.5 i386 anymore

[MacPorts]

#65795: harfbuzz-icu can't be compiled on 10.5 i386 anymore
---------------------------+----------------------
  Reporter:  catap         |      Owner:  mascguy
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  harfbuzz-icu  |
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Comment (by catap):

 Nope, I'm wrong. The issue came from another condition:
 https://github.com/macports/macports-legacy-
 support/blob/master/include/MacportsLegacySupport.h#L128-L134

 It decided that `__MP_LEGACY_SUPPORT_CXX11_CMATH__` should be `0` for
 clang-7.

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Ticket URL: <https://trac.macports.org/ticket/65795#comment:5>
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