[MacPorts] #68606: smlnj: update to the new version, retain current as smlnj-legacy (following upstream)

[MacPorts]

#68606: smlnj: update to the new version, retain current as smlnj-legacy (following
upstream)
----------------------------+--------------------------
  Reporter:  barracuda156   |      Owner:  tobypeterson
      Type:  defect         |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:  wontfix        |   Keywords:  arm64
      Port:  hamlet, smlnj  |
----------------------------+--------------------------

Comment (by tobypeterson):

 That said, if you want to a submit an update to 110.99.4, that'd be
 helpful. It won't build on Apple silicon machines, and I don't have
 immediate access to an intel machine.

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Ticket URL: <https://trac.macports.org/ticket/68606#comment:14>
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