[MacPorts] #68606: hamlet does not build for aarch64

[MacPorts]

#68606: hamlet does not build for aarch64
----------------------------+--------------------------
  Reporter:  barracuda156   |      Owner:  barracuda156
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:  arm64
      Port:  hamlet, smlnj  |
----------------------------+--------------------------

Comment (by barracuda156):

 Replying to [comment:1 ryandesign]:
 > {{{
 > Error: Cannot install hamlet for the arch 'arm64' because
 > Error: its dependency smlnj only supports the archs 'x86_64 i386 ppc'.
 > }}}

 Ah, fair enough, I should have looked into the log. Sorry about that.

 Current `smlnj` is what is `smlnj-legacy` with upstream: it is still
 maintained but perhaps without new platforms added. New `smlnj` is only
 64-bit: https://github.com/smlnj/smlnj/issues/274
 (So whenever we upgrade, a legacy version should be retained for `ppc` and
 `i386`.)

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Ticket URL: <https://trac.macports.org/ticket/68606#comment:2>
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