[MacPorts] #68606: smlnj: update to the new version, retain current as smlnj-legacy (following upstream) (was: hamlet does not build for aarch64)

[MacPorts]

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

Old description:

> https://ports.macports.org/port/hamlet/details

New description:

 Dependencies are broken on arm64, since `smlnj` (legacy) does not support
 it: https://ports.macports.org/port/hamlet/details
 (Current `smlnj` is 64-bit-only, so we will need to retain a legacy
 version.)

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Ticket URL: <https://trac.macports.org/ticket/68606#comment:3>
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