[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@…):

 Replying to [comment:2 howarth@…]:
 > Note that the patch has to bundle the private tk headers since MacPorts
 doesn't install the private headers. On FreeBSD and fink, we do install
 the private tcl/tk headers so that those are used instead. FYI.

 Homebrew also installs the private tcl/tk headers. See also the ticket I
 opened about this (#39431) and the ticket that it was closed as a
 duplicate of (#17189) for more on installing the private tcl/tk headers.

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Ticket URL: <https://trac.macports.org/ticket/40203#comment:4>
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