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

[MacPorts]

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

Comment (by ryandesign@…):

 That's what I'm doing as well. Could you attach the main.log from your
 successful build? If you haven't already, you'll need to set "keeplogs
 yes" in macports.conf, or install with the -k flag.

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Ticket URL: <https://trac.macports.org/ticket/37505#comment:7>
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