[MacPorts] #67821: mlton: needs a fix for 10.6–10.7

[MacPorts]

#67821: mlton: needs a fix for 10.6–10.7
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 Reporter:  barracuda156  |      Owner:  barracuda156
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  mlton, mlton-bootstrap
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 Basically, a reminder to myself:

 1. Add a fix for Rosetta build (trivial one, to force the correct arch).
 2. Drop one redundant reinplace case.
 3. Wait until upstream responds here, and probably switch 10.6–10.7 x86_64
 to an earlier version of `mlton-bootstrap`:
 https://github.com/MLton/mlton/issues/502

 I hoped to avoid the latter, since adding an extra version requires an
 ugly trickery for `mlton-bootstrap`, but what to do.

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Ticket URL: <https://trac.macports.org/ticket/67821>
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