[MacPorts] #62474: tensorflow build fails on 10.15

[MacPorts]

#62474: tensorflow build fails on 10.15
----------------------------+--------------------------
  Reporter:  essandess      |      Owner:  emcrisostomo
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.4
Resolution:                 |   Keywords:
      Port:  py-tensorflow  |
----------------------------+--------------------------

Comment (by essandess):

 This is also an issue on other macOS versions with bazel builds of other
 ports, as observed in the build bot.

 See:
 * https://github.com/macports/macports-ports/pull/10294
 * https://github.com/macports/macports-
 ports/pull/10294/checks?check_run_id=2131101152
 *
 https://dev.azure.com/macports/b674ed54-8ab2-4ec0-8010-7d35a798a53c/_apis/build/builds/12899/logs/11

 {{{
 failed: I/O exception during sandboxed execution: xcrun failed with code
 1.
 2021-03-17T13:54:58.5545850Z This most likely indicates that SDK version
 [10.14] for platform [MacOSX] is unsupported for the target version of
 xcode.
 2021-03-17T13:54:58.5648320Z Process exited with status 1
 2021-03-17T13:54:58.5750100Z stdout: stderr: xcodebuild: error: SDK
 "macosx10.14" cannot be located.
 2021-03-17T13:54:58.5853880Z xcodebuild: error: SDK "macosx10.14" cannot
 be located.
 2021-03-17T13:54:58.5956190Z xcrun: error: unable to lookup item 'Path' in
 SDK 'macosx10.14'
 2021-03-17T13:54:58.6058010Z Target //tree:_tree failed to build
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/62474#comment:19>
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