[MacPorts] #71395: libsigcxx2/3, libxmlxx5: Reduce dependencies

[MacPorts]

#71395: libsigcxx2/3, libxmlxx5: Reduce dependencies
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  Reporter:  Dave-Allured                       |      Owner:  mascguy
      Type:  enhancement                        |     Status:  assigned
  Priority:  Normal                             |  Milestone:
 Component:  ports                              |    Version:
Resolution:                                     |   Keywords:
      Port:  libsigcxx2, libsigcxx3, libxmlxx5  |
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Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"3befd77eca6e03511753292bb48e010943cb50f3/macports-ports"
 3befd77eca6e03511753292bb48e010943cb50f3/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="3befd77eca6e03511753292bb48e010943cb50f3"
 libsigcxx{2,3}: disable docs; drop deps graphviz and doxygen

 See: https://trac.macports.org/ticket/71395
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71395#comment:3>
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