[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:
      Port:  blt           |
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Comment (by ryandesign@…):

 This patch gets past this error but then fails at:
 {{{
 Undefined symbols for architecture x86_64:
   "_TkCopyAndGlobalEval", referenced from:
       _ButtonWidgetCmd in libBLT.a(tkButton.o)
 ld: symbol(s) not found for architecture x86_64
 }}}

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Ticket URL: <https://trac.macports.org/ticket/37505#comment:1>
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