[MacPorts] #54634: smlnj @110.80: update to 110.81

[MacPorts]

#54634: smlnj @110.80: update to 110.81
---------------------+-------------------
 Reporter:  SuperBo  |      Owner:
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.4.1
 Keywords:           |       Port:  smlnj
---------------------+-------------------
 SML/NJ 110.81 was released on May 1, 2017. Please update it to latest
 version.
 http://www.smlnj.org/dist/working/110.81/index.html

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Ticket URL: <https://trac.macports.org/ticket/54634>
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