[MacPorts] #72228: duplicity @2.14: duplicity --version does not print version number

[MacPorts]

#72228: duplicity @2.14: duplicity --version does not print version number
------------------------+-----------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.10.5
 Keywords:              |       Port:  duplicity
------------------------+-----------------------
 {{{
 % duplicity --version
 duplicity $version
 }}}

 The readme says this will happen when building source code that came from
 git. To fix this, we should use the release tarball instead.

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Ticket URL: <https://trac.macports.org/ticket/72228>
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