[MacPorts] #39431: tcl @8.6.0 and tk @8.6.0: install private headers

[MacPorts]

#39431: tcl @8.6.0 and tk @8.6.0: install private headers
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 Reporter:  egall@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.1.3
 Keywords:           |       Port:  Tcl Tk
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 There are some things that look for them. Installing these headers is a
 simple matter of appending `install-private-headers` to the
 `build.targets`.  Also Homebrew does this with their tcl-tk formula:
 https://github.com/Homebrew/homebrew-dupes/blob/master/tcl-tk.rb#L58

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Ticket URL: <https://trac.macports.org/ticket/39431>
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