[MacPorts] #37505: blt: build fails with tcl 8.6

[MacPorts]

#37505: blt: build fails with tcl 8.6
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  Reporter:  ryandesign@…  |      Owner:  markd@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.2
Resolution:                |   Keywords:  haspatch
      Port:  blt           |
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Comment (by ryandesign@…):

 Jack, does blt install successfully for you with the patch you added to
 #37532? If so, we need to figure out what's different between your machine
 and mine and why it won't install on mine.

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Ticket URL: <https://trac.macports.org/ticket/37505#comment:5>
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