[MacPorts] #70037: abseil-20240116.2_1: fails to build on macOS 10.14.6/Xcode 11.3.1 due to SDKROOT being set to MacOSX10.14.sdk

[MacPorts]

#70037: abseil-20240116.2_1: fails to build on macOS 10.14.6/Xcode 11.3.1 due to
SDKROOT being set to MacOSX10.14.sdk
------------------------+--------------------
  Reporter:  jbflanman  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.9.3
Resolution:             |   Keywords:  Mojave
      Port:  abseil     |
------------------------+--------------------
Changes (by jbflanman):

 * Attachment "abseil_postClean2_main.zip" added.

 main.log for abseil failure after both clean commands.

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Ticket URL: <https://trac.macports.org/ticket/70037>
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