[MacPorts] #50856: fish @2.2.0_1 add new doc variant

[MacPorts]

#50856: fish @2.2.0_1 add new doc variant
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 Reporter:  riite@…      |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Low          |  Milestone:
Component:  ports        |    Version:  2.3.4
 Keywords:               |       Port:  fish
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 Currently there's no way to opt in/out from building the docs, nor from
 getting the unneeded dependencies that come with doxygen and graphviz.
 Those dependencies are only needed when Doxygen is used to regenerate
 documentation (`./configure --with-doxygen`).

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Ticket URL: <https://trac.macports.org/ticket/50856>
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