[MacPorts] #70403: qpdf: add shell completion

[MacPorts]

#70403: qpdf: add shell completion
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  Reporter:  contextnerror  |      Owner:  Schamschula
      Type:  enhancement    |     Status:  closed
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:  fixed          |   Keywords:
      Port:  qpdf           |
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Comment (by contextnerror):

 Completion does not currently work because the file hardcodes
 `/usr/bin/qpdf`

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Ticket URL: <https://trac.macports.org/ticket/70403#comment:6>
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