[MacPorts] #37583: base: Update m4/tcl.m4 to check for tcl8.6

[MacPorts]

#37583: base: Update m4/tcl.m4 to check for tcl8.6
--------------------------+----------------------
  Reporter:  cooljeanius  |      Owner:  larryv
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.2
Resolution:  wontfix      |   Keywords:  haspatch
      Port:               |
--------------------------+----------------------
Changes (by jmroot):

 * status:  reopened => closed
 * resolution:   => wontfix


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Ticket URL: <https://trac.macports.org/ticket/37583#comment:5>
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