[MacPorts] #72159: genie: fix build failure due to macosx-version-min=11.0

[MacPorts]

#72159: genie: fix build failure due to macosx-version-min=11.0
---------------------+----------------------
 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.10.5
 Keywords:           |       Port:  genie
---------------------+----------------------
 Details:

 {{{
 clang: error: invalid version number in '-mmacosx-version-min=11.0'
 }}}

 It should be fairly easy to patch upstream's build script.

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Ticket URL: <https://trac.macports.org/ticket/72159>
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