[MacPorts] #62770: clang++ 11 broken by MacOS 11.3 update

[MacPorts]

#62770: clang++ 11 broken by MacOS 11.3 update
-----------------------+---------------------------
  Reporter:  haberg-1  |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur x86_64
      Port:  clang-11  |
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Changes (by landonf):

 * Attachment "0001-clang-11-Backport-upstream-clang-12-patch-for-
 sysroo.patch" added.

 Backport upstream clang-12 patch for <sysroot> for C++ headers

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Ticket URL: <https://trac.macports.org/ticket/62770>
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