[MacPorts] #43917: ROOT6 : Update to first production release, 6.00.00

[MacPorts]

#43917: ROOT6 : Update to first production release, 6.00.00
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  Reporter:  jonesc@…  |      Owner:  mojca@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  haspatch maintainer
      Port:  root6     |
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Comment (by mojca@…):

 Yes, I changed it. Because from what I uderstand `[info exists
 configure.cxx_stdlib]` is always true since MacPorts 2.3.

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Ticket URL: <https://trac.macports.org/ticket/43917#comment:48>
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