[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:
Resolution:                 |   Keywords:
      Port:  qpdf           |
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Comment (by contextnerror):

 The files are located in the "completions" folder, under "bash" and "zsh"
 respectively.\\

 My understanding is that not installing the files is the intended
 behavior. Documentation claims that "qpdf's install targets do not install
 completion files by default since there is no standard location for them".

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Ticket URL: <https://trac.macports.org/ticket/70403#comment:4>
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