[MacPorts] #62815: Update to Tcllib 1.20

[MacPorts]

#62815: Update to Tcllib 1.20
--------------------------+--------------------
  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.6.4
Resolution:               |   Keywords:
      Port:               |
--------------------------+--------------------

Comment (by jmroot):

 In progress as part of https://github.com/neverpanic/macports-
 base/tree/tcl86

-- 
Ticket URL: <https://trac.macports.org/ticket/62815#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS