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

[MacPorts]

#37583: base: Update m4/tcl.m4 to check for tcl8.6
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  Reporter:  egall@…      |      Owner:  larryv@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.2
Resolution:  fixed        |   Keywords:  haspatch
      Port:               |
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Comment (by egall@…):

 According to #42756, this patch was actually incorrect because MacPorts
 does not actually work with Tcl 8.6... sorry about that...

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Ticket URL: <https://trac.macports.org/ticket/37583#comment:3>
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