[MacPorts] #71149: libomp @19.1.2 fails to configure on < 10.15

[MacPorts]

#71149: libomp @19.1.2 fails to configure on < 10.15
--------------------+----------------------
 Reporter:  jmroot  |      Owner:  eborisch
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libomp
--------------------+----------------------
 e.g.
 https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/221222/steps
 /install-port/logs/stdio
 {{{
 CMake Error at
 /opt/local/share/cmake-3.29/Modules/FindPackageHandleStandardArgs.cmake:230
 (message):
   Could NOT find Python3 (missing: Python3_EXECUTABLE Interpreter)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71149>
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