[MacPorts] #61430: Allow x86_64 ports to be used on arm64 hardware via Rosetta 2

[MacPorts]

#61430: Allow x86_64 ports to be used on arm64 hardware via Rosetta 2
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 Replying to [ticket:61430 ryandesign]:
 > This would match how we allowed PowerPC apps to run on Intel Macs via
 Rosetta.

 Am I misremembering? I thought we allowed that, but
 [https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/38491/steps
 /install-port/logs/stdio trying to install a ppc-only port] on 10.6 I get:

 {{{
 Error: graphviz-oldgui cannot be installed for the configured build_arch
 'x86_64' because it only supports the arch(s) 'ppc'.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61430#comment:3>
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