[MacPorts] #61652: c-ares @1.17.1 does not build on Big Sur X86_64, but the build bot has no problem with arm64 build

[MacPorts]

#61652: c-ares @1.17.1 does not build on Big Sur X86_64, but the build bot has no
problem with arm64 build
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  Reporter:  snowflake  |      Owner:  tobypeterson
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.5.99
Resolution:             |   Keywords:
      Port:  c-ares     |
------------------------+--------------------------
Changes (by snowflake):

 * Attachment "c-ares-2020-01-27.main.log.gz" added.

 mani.log with verbose logging

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Ticket URL: <https://trac.macports.org/ticket/61652>
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