[MacPorts] #62815: Update to Tcllib 1.20

[MacPorts]

#62815: Update to Tcllib 1.20
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 Reporter:  ryandesign   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.6.4
 Keywords:               |       Port:
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 MacPorts base bundles Tcllib 1.18. 1.20 is available. If it is compatible
 with Tcl 8.5 and the way we use Tcllib, we should update to it.

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Ticket URL: <https://trac.macports.org/ticket/62815>
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