[MacPorts] #70496: libvirt broken by meson on < 10.7

[MacPorts]

#70496: libvirt broken by meson on < 10.7
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  Reporter:  barracuda156  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:  tiger, leopard, snowleopard
      Port:  libvirt       |
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Comment (by ryandesign):

 This seems like a meson bug. It already doesn't install on < 10.7 because
 of glib2 failing to build due to the same error; #70386.

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Ticket URL: <https://trac.macports.org/ticket/70496#comment:1>
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