[MacPorts] #55663: qpdf @6.0.0 upgrade

[MacPorts]

#55663: qpdf @6.0.0 upgrade
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 Reporter:  detlevd            |      Owner:
     Type:  update             |     Status:  new
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:  2.4.2
 Keywords:  upgrade, haspatch  |       Port:  qpdf
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 qpdf 6.0.0 is outdated, tools like ocrmypdf recommend to use qpdf 7.0.0.

 Upgrading the Portfile is straight forward. (attached)
 It now additionally requires port:jpeg

 Issue #42101 is still present, direct upgrading might fail since the build
 process tries to link with the old libraries. Deactivation or uninstalling
 helps as a workaround.

 Tested on OSX 10.12.6, clang 9.0.0, Xcode 9.2

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Ticket URL: <https://trac.macports.org/ticket/55663>
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