[MacPorts] #66965: i2pd: fix building shared libs

[MacPorts]

#66965: i2pd: fix building shared libs
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 Reporter:  herbygillot  |      Owner:  herbygillot
     Type:  defect       |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  i2pd
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 https://github.com/PurpleI2P/i2pd/issues/1860

 {{{
 On a side note, do you have an idea how to fix building shared libs? I
 tried passing a standard CMake arg for that, tried explicitly setting a
 target, but the build fails badly at linking then.
 According to upstream, with Makefiles it works correctly (not sure if on
 macOS though and when last time tested).
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66965>
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