[MacPorts] #73180: Retry macOS 26 builds on buildbot with Xcode 26 Metal toolchain fix in place

[MacPorts]

#73180: Retry macOS 26 builds on buildbot with Xcode 26 Metal toolchain fix in
place
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  Reporter:  markmentovai                        |      Owner:  ryandesign
      Type:  request                             |     Status:  reopened
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  qt6-qtwebengine, openjdk17,         |
  openjdk21, openjdk25                           |
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Comment (by breun):

 Replying to [comment:51 ryandesign]:
 > I would like to add a check to the buildbot worker startup script so
 that it does not start if the Metal toolchain is not satisfactorily
 installed, so that this problem can be detected earlier, if someone can
 tell me what command would determine that, since `xcrun metal -v`
 evidently isn't sufficient.

 From your comment it seems like that command is actually sufficient,
 because it returned 0 when it was ok and 1 when it wasn’t, right?

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Ticket URL: <https://trac.macports.org/ticket/73180#comment:52>
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