[MacPorts] #37481: doxygen: Remove broken +tcl variant

[MacPorts]

#37481: doxygen: Remove broken +tcl variant
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 Reporter:  raimue@…  |      Owner:  css@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.1.2
 Keywords:  haspatch  |       Port:  doxygen
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 doxygen +tcl is broken as the patch file does not apply. Furthermore, Tcl
 is supported by upstream as of version 1.7.5 according to this
 [http://wiki.tcl.tk/27011 Tcl wiki page].

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Ticket URL: <https://trac.macports.org/ticket/37481>
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