[MacPorts] #43838: emulators/qemu: add aarch64 (64-bit ARM) target.

[MacPorts]

#43838: emulators/qemu: add aarch64 (64-bit ARM) target.
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 Reporter:  crossd@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  qemu
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 Added target_aarch64 (64-bit ARM) to the variants list.

 Aarch64 support was added in QEMU 2.0.0, which is the current ported
 version: this change simply exposes the architecture.

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Ticket URL: <https://trac.macports.org/ticket/43838>
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