[MacPorts] #56807: support tk +quartz variant in Tcl/Tk extensions

[MacPorts]

#56807: support tk +quartz variant in Tcl/Tk extensions
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 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.5.3
 Keywords:                |       Port:  tix tktable p5-tcl-ptk
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 The port for Tcl/Tk has both x11 and quartz ("aqua" native UI) variants.
 Ideally, the ports for any Tcl/Tk extensions should also support aqua in
 addition to X11. Some extensions with ports I know of so far are Tix and
 TkTable, since those can be used to extend the functionality available in
 `p5-tcl-ptk`, but there are probably are a few more.

 Since tix and tktable are `nomaintainer`, I understand that it will
 probably be up to myself to implement this. I may need some assistance in
 configuring things like variants properly, though.

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Ticket URL: <https://trac.macports.org/ticket/56807>
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