[MacPorts] #49359: tdom: fix build failure with tcl 8.6 (was: fix for port tdom)

[MacPorts]

#49359: tdom: fix build failure with tcl 8.6
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  Reporter:  neumann@…  |      Owner:  macports-tickets@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.4
Resolution:             |   Keywords:  haspatch maintainer
      Port:  tdom       |
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Comment (by ryandesign@…):

 Thanks. For future reference, you should provide a unified diff of your
 portfile changes, instead of a complete new portfile.

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Ticket URL: <https://trac.macports.org/ticket/49359#comment:1>
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