[MacPorts] #62815: Update to Tcllib 1.20

[MacPorts]

#62815: Update to Tcllib 1.20
--------------------------+------------------------
  Reporter:  ryandesign   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  accepted
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.6.4
Resolution:               |   Keywords:
      Port:               |
--------------------------+------------------------
Changes (by neverpanic):

 * owner:  (none) => neverpanic
 * status:  new => accepted


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Ticket URL: <https://trac.macports.org/ticket/62815#comment:6>
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