[MacPorts] #59665: gcc9 pre-built binary can't access system SDK with Xcode 11.2 under Mojave

[MacPorts]

#59665: gcc9 pre-built binary can't access system SDK with Xcode 11.2 under Mojave
-------------------------+--------------------
  Reporter:  EJFielding  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  gcc9 gcc7   |
-------------------------+--------------------

Comment (by kencu):

 It seems that our prebuilt gcc ports from the buildbot are built looking
 into Xcode. There is at least one other similar ticket #59727 out there.
 Hopefully will just need to revbump them to get them to rebuild against
 the CLTs.

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Ticket URL: <https://trac.macports.org/ticket/59665#comment:2>
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