[MacPorts] #70681: Unnecessary dependency on zsh

[MacPorts]

#70681: Unnecessary dependency on zsh
-------------------------+-------------------------------------
 Reporter:  davidhaller  |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Low          |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  zsh-syntax-highlighting
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 This port depends on the zsh port, but works also perfectly fine with the
 zsh version provided by macOS (which is currently the same version than
 those provided by MacPorts). Since it is unnecessary to force two copies
 of the same software to be installed, the dependency should be removed.

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Ticket URL: <https://trac.macports.org/ticket/70681>
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