[MacPorts] #40203: use FreeBSD patch-use-tkInt approach to fix tcltk 8.6 support

[MacPorts]

#40203: use FreeBSD patch-use-tkInt approach to fix tcltk 8.6 support
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  Reporter:  howarth@…  |      Owner:  markd@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  blt        |
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Comment (by egall@…):

 Also my copy of the proposed port for tcl84 would also install the private
 headers (for its version): see #34826 and
 https://github.com/cooljeanius/LocalPorts/blob/master/lang/tcl84/Portfile#L43

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Ticket URL: <https://trac.macports.org/ticket/40203#comment:6>
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