[MacPorts] #69106: py38-setuptools_scm, py39-setuptools_scm @8.0.4 fails to install, while py310-setuptools_scm and later install fine

[MacPorts]

#69106: py38-setuptools_scm, py39-setuptools_scm @8.0.4 fails to install, while
py310-setuptools_scm and later install fine
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  Reporter:  barracuda156                        |      Owner:  stromnov
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.8.1
Resolution:                                      |   Keywords:
      Port:  py39-setuptools_scm,                |
  py38-setuptools_scm                            |
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Comment (by barracuda156):

 Replying to [comment:15 barracuda156]:
 > Upstream says it is Macports set-up is wrong here:
 https://github.com/pypa/setuptools_scm/issues/1013

 I was able to reproduce the same failure for `py38-setuptools_scm` on
 10.6.8, and can confirm that suggestion from upstream works.

 We need to set build conflict with itself for this port.

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Ticket URL: <https://trac.macports.org/ticket/69106#comment:19>
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