[MacPorts] #67572: gperftools: arm: cmake arch check broken, causing build failures

[MacPorts]

#67572: gperftools: arm: cmake arch check broken, causing build failures
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  Reporter:  mascguy     |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  arm
      Port:  gperftools  |
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Comment (by mascguy):

 Replying to [comment:3 ryandesign]:
 > Since that change is based on `configure.build_arch`, I wonder what will
 happen with a universal build.

 Yep, universal testing is on my list too. But the committed fix doesn't
 work anyway, so I need to scrutinize the ARM check logic. (One key
 difference, is that I added `libunwind` to the mix: It's supposed to
 provide more reliable stack tracing, but also introduces another variable
 vis-a-vis the previous port iteration.)

 Will look at this more closely tomorrow.

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Ticket URL: <https://trac.macports.org/ticket/67572#comment:4>
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