[MacPorts] #63331: mame: use macports-libcxx on 10.13 and earlier, to support latest upstream release

[MacPorts]

#63331: mame: use macports-libcxx on 10.13 and earlier, to support latest upstream
release
-----------------------------+----------------------
 Reporter:  mascguy          |      Owner:  mascguy
     Type:  enhancement      |     Status:  assigned
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:
 Keywords:  macports-libcxx  |       Port:  mame
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 Tracking ticket for work related to updating Mame to utilize `macports-
 libcxx` on 10.13 and earlier. This would provide our users with the latest
 Mame release on older macOS versions, which is not possible with the host-
 provided libcxx.

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Ticket URL: <https://trac.macports.org/ticket/63331>
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