[MacPorts] #46223: Install private Tk headers too

[MacPorts]

#46223: Install private Tk headers too
--------------------------+--------------------------------
 Reporter:  stephanh42@…  |      Owner:  macports-tickets@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.3
 Keywords:                |       Port:  tk
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 Many Tk extensions rely on the "private" headers (tkInt*.h)
 being available, inluding:
 * togl
 * Tcl3d
 * tkpath

 Note that Ubuntu/Debian install these headers by default.
 I think it makes sense to do so too.

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Ticket URL: <https://trac.macports.org/ticket/46223>
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