[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
------------------------+--------------------------------
  Reporter:  howarth@…  |      Owner:  macports-tickets@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  blt        |
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Comment (by MarcusCalhoun-Lopez):

 In [changeset:"609fbf58946ddea1f0c1ae959931cdc7502e97bb/macports-ports"
 609fbf58946ddea1f0c1ae959931cdc7502e97bb/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="609fbf58946ddea1f0c1ae959931cdc7502e97bb"
 tk: install private header file

 Installing these header files seems to be a common practice.
 See https://trac.macports.org/ticket/40203.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/40203#comment:11>
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