[MacPorts] #70403: qpdf: add shell completion

[MacPorts]

#70403: qpdf: add shell completion
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 Reporter:  contextnerror  |      Owner:  Schamschula
     Type:  enhancement    |     Status:  assigned
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:  qpdf
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 qpdf seems to support shell completion, but at the moment the port does
 not appear to take advantage of it. Could this be implemented?

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Ticket URL: <https://trac.macports.org/ticket/70403>
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